A person whose lack of skill and knowledge in a particular field do not stop him/her from participating and commenting extensively in and on that area. Boomheads litter most poker tables and can be identified by their thick verbal effluent. Salespersons are usually boomheads. All boomheads blow up in the end.
Ed: Dude, Murray's been telling me to put all my money in Bear Stearns stocks. He says I can't lose.
Al: Don't listen to Murray. He's a boomhead.
This is a term used by older brothers who are refering to their younger sisters. It has no set deffinition but just know that it has to do with a 'heart'. that didn't tell you what you wanted to know did it? yeah, me either.
older brother:"you are such a boomhead!"
younger sister:"what does that mean?!?"
A sexual technique amongst gay males, where one will fellate the other until the male receiving fellatio ejaculates in the mouth of the other. The fellater then sneezes (with a mouth full of ejaculate) on the receiver, spraying him with his own semen. Afterwords, they yell "BOOMHEAD!" and share a high five.
Tony: I gave Francois some wikked BOOMHEAD last nite.
Joe: Get the hell away from me.