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15.
1. The hydrogen bomb (DUH!)
2. The offensive social label "hipster" - not to be used around anyone who

-your black-and-white brain labels a 'hipster'
-has good style, making you jealous, would get photographed by a style publication if it was in the vicinity
-aspires to be a hipster!
-understands but rejects hipster culture

"the first rule of hipsterdom is: don't talk about hipsterdom" --anonymous hipster who looks like brad pitt but also knows what the fuck he's talking about
"Ugh fucking hipster. cigs are gross"
"Don't drop the H-bomb when we're in this bar, I'm still tryna get laid by this guy in the APCs! also shh i love cigs"

Newcomer: "You look hip"
BFF1: "haha yeah, thanks I guess, I love this skirt, I got it last summer from opening ceremony"
BFF2: "don't drop the H-bomb around her, she gets really defensive -- she's sick of being lumped into it at Brown"
by ktBbb June 19, 2011
 
1.
1. Telling someone that you go (went) to Harvard. Usually used in the phrase "to drop the h-bomb." It is a generally accepted principle of dropping the h-bomb that when a guy drops it, he instantly becomes more attractive, but when a girl drops it, she becomes less so. 2. Sex magazine at Harvard.
Mary was talking to a hot guy at the club the other night, but as soon as she dropped the h-bomb, he said he had to go.
by Margaret July 27, 2004
 
2.
Abbreviation for "Hydrogen Bomb". The hydrogen bomb is the big brother of the first nuclear bombs, Fat Man and Little Boy, which were dropped on Nagasaki and Heroshima in 1945.

The hydrogen bomb uses a hydrogen neutron, fired at high speed, into an atom of some unstable element, usually uranium. This causes the uranium particle to separate. This, in turn, releases alot of enegry. The two halfs then proceed to re-do the above steps in a Chain Reaction, which is called fission.
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EDIT: Actually it fuses together the neutrons of hydrogen in a thermonuclear reaction, not split apart the uranium.
Usually with a blast diameter of 10+ miles, as opposed to 1 mile diameter for an A bomb.
The Doomsday device.
by Intranetusa August 21, 2005
 
3.
When a Harvard student or graduate casually mentions his affiliation with Harvard, usually in an attempt to impress people at a party or other social gathering.
Timmy dropped an H-bomb and the girls were all over him at the Tufts party.
by Nutmegger November 11, 2003
 
4.
the word hell, as used by Meatwad, a character from Aqua Teen Hunger Force, a cartoon shown on Adult swim, on Cartoon Network.
...droppin the H-bomb up in here
by Olly J February 06, 2005
 
5.
A weapon in the form of a missle warhead and, or Bomb that works on the property of fusing hydrogen together and harnessing the energy that comes from it. Some of which have sunk entire islands and can pollute the ground for at least 50 years or more.
I could turn this key, press this red button, launch this Thermonuclear weapon, and send us all to hell!
by Maraxus January 04, 2004
 
6.
A coloquial form of name dropping practiced by students of Harvard University (or anyone else with the guile) whereby someone mentions their affiliation with Harvard to seduce a potential sex partner.
I've only ever dropped the H bomb once, but it totally worked: I got a chick to give me a blow job fifteen minutes after I met her.
by Craig C. May 10, 2006
 
7.
H-Bomb- Is heroin, dope, chiva
Ey you know where i can score that H-Bomb??
by E-LOCO April 08, 2010