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In Texas Hold'em, a player in first position who overplays his/her hand going all-in.

Everyone folds and the boomer takes the blinds only.
You went all-in with a premium hand and only won the blinds?

Nice play there Boomer!
Boomer by aloha27 October 31, 2009
Ay, you heard that Heytvelt got popped for boomers?
boomer by tippleman March 27, 2007
boomer: Hey how does this computer work?! HELP ME! God your generation is so LAZY!
Zoomer: OKAY BOOMER!
boomer by 🤏Urban Dictionary🤏 November 20, 2019
US Navy slang for a ballistic-missile submarine.

http://en.wikipedia.org/wiki/Ballistic_missile_submarine
The US Navy boomers are the Ohio-class.
Boomer by Axeman73 April 10, 2009
While observing a fat person puking it is customary to yell BOOMER to warn others so as not to attract the horde! Also works well as an insult.
Guy #1: "Holy shit you see that fat girl in the backyard puking?!"

Guy #2: "BOOMER! Watch Out!"
BOOMER by Jonan2012 October 27, 2010
Literally anyone that is older than you.
Individual 1: Did you hear that John got a job?
Individual 2: God he's such a boomer.
Individual 1: Dude he's only a year older than you...
Boomer by TheLomster June 13, 2019