When a person is smoking weed in a group and instead of passing it around so the next guy gets a hit, he smokes it like Humphry Bogart used to smoke cigarettes in his movies.

It means to hog something or not share. Word of caution: You might not want to use words you don't know for risk of sounding foolish. ;)

Derived from the name Humphrey Bogart, who seemed to always have a cigarette in his mouth but never seemed to smoke it. Often used when smoking joints, meaning to hog the joint. http://www.urbandictionary.com/define.php?term=bogart

EtymologyAmerican English slang origin, from actor Humphrey Bogart. Senses of selfishness and excess evolved from the original 1960's use meaning "keep a joint in the mouth instead of passing it on", recalling the actor's signature practice of constantly keeping a cigarette dangling out of his mouth, even while talking. Other senses of "bullying" or "tough guy" also originated in the 1960's and recall the actor's various movie roles. NounSingular bogart Plural bogarts bogart (plural bogarts) (slang, also Bogart drag) A very long inhalation of smoke, particularly marijuana. He took a huge bogart from the joint before finally passing it on. (slang) Excess. There are over two dozen related terms for station? What a bogart! (slang) One given to excess, whether good or ill. Smith is the writer, director, star and producer. What a bogart! (slang) An obnoxious, selfish and overbearing person; an attention hog. He walked in, swiped my beer off the table and chugged it. I said "Dude, don't be a bogart," but he didn't care. (slang) A disappointment. Then right in the middle of their best song, the power went out? That's a bogart. (slang) The first cup of brewed coffee collected from under the coffee filter. Also, a cup of very strong coffee...much the same as espresso. Would you like a cup of bogart now or would you rather wait for the coffee to finish brewing? [edit] VerbInfinitive to bogart Third person singular bogarts Simple past bogarted Past participle bogarted Present participle bogarting to bogart (third-person singular simple present bogarts, present participle bogarting, simple past and past participle bogarted) (slang) To selfishly take or keep something; to hog; especially to hold a joint (marijuana) dangling between the lips instead of passing it on. Dude, don't bogart the chocolate fudge! Don't bogart the can, man. (slang) To get something by bullying, intimidation; be a tough guy. He tried to bogart his way in. Retrieved from "http://en.wiktionary.org/wiki/bogart"

means to hog a joint, but is used for many different meanings like for example dude he bogarted the last piece of pizza

It basically means to hog something. http://www.urbandictionary.com/define.php?term=bogarted

From the Urban Dictionary: (slang verb) To keep something all for oneself, thus depriving anyone else of having any. A slang term derived from the last name of famous actor Humphrey Bogart because he often kept a cigarette in the corner of his mouth, seemingly never actually drawing on it or smoking it. Often used with weed or joints but can be applied to anything. see: http://www.urbandictionary.com/define.php?term=bogart