Stating someone is smash
Mike: Did you see Lexi tonight?
Justin: The one in the black top?
Mike: Yeah I'd buckle.
to crack under pressure
this nigga buckled at the foul line wit 2 seconds left and airballed it
The act of releasing vile waste.
Be careful, Kyle just Buckled in there.
a really expensive store
hey how much are those jeans?
holy crap! how much is that shirt?
To get down to business, to study. Usually used by students who have felt their academic performance to be sub-par.
"I've got to buckle, Iana. Next semester I've got eight classes - all in calculus."
"To hell with buckling, I need to party!"
To trip over by accident i.e over a curb.
"Oh, he buckled and cracked his neck"
A wife that makes you buckle down.
That wife of mine (Buckles) always naggin me talkin bout I need to buckle down.