It means OLD... It's a generation that's called the " Baby Boomers" but in slang if you say boomer it means old. So basically if you call someone/something a boomer then you are calling them old or calling the thing old.
by the dictonary BITCH November 13, 2019
a phrase used by Jamal from The Netflix series on my block. It basically stands for " Bitches Be Bonkers"
by the dictonary BITCH March 19, 2019
by the dictonary BITCH December 06, 2019