Its used as reassurance to make sure your being compleatly honest. If you sware on the boys and a bro finds out that you lied, your not concidered a true friend. One is never supposed to be dishonest while swaring on the boys, its just something you don't do.
bro 1: Did you see my x-girlfriend with Alec last night at that party you went to?
bro 2: Nah man she was solo.
bro 1: On the boys?
bro 2: Alright alright alright I'll tell you verything I saw if you sware on the boys you wont tell Alec.
bro 2: Nah man she was solo.
bro 1: On the boys?
bro 2: Alright alright alright I'll tell you verything I saw if you sware on the boys you wont tell Alec.
by Dumpster Bagel June 29, 2009
Get the On the boysmug. A group of teenage or middle school boys that make homophobic, racist, sexist jokes and call it dArk hUmor
by Norah.aiko August 28, 2020
Get the The boysmug. 
by lawlstothawall December 9, 2008
Get the Boymug. That boy is dressed like a girl.
by Pocahontas April 8, 2005
Get the Boymug. The biggest, pithiest, bullshittest excuse for male behavior that is otherwise legally/morally unacceptable from birth to the grave. Covers socially perverse actions that no girl could ever get away with without the label to the effect of "weird/evil" or "whore", i.e. like fighting, having promiscuous sex, cruelty to people and animals, or any behavior combining selfishness and aggression.
Teacher 1: Last week, one of my students mooned the class. When I called his father, he apologized, laughed and said "Boys will be boys."
Teacher 2: True enough.
Teacher 1: A few days later, his daughter did the same thing. He came down, mortified, and spanked her right in the principal's office.
Teacher 2: Sounds fair.
Teacher 2: True enough.
Teacher 1: A few days later, his daughter did the same thing. He came down, mortified, and spanked her right in the principal's office.
Teacher 2: Sounds fair.
by bitteryoungwoman April 11, 2009
Get the Boys will be boysmug.