(verb) To die or, more specifically, to be
killed.
"Your" can be substituted with any pronoun, depending on the
context. See
examples below.
An Army Officer addressing his men before battle: Men,
I'm not gonna sugarcoat it. Jerry has got at least a dozen machineguns up on that hill. But the word's come down
from the top brass; we're to take that position at all costs. Be careful, watch each other's backs, and don't drop your bones.
A Cuckold to his friend upon seeing the man who fucked his wife: I'm gonna go drop his bones.
The Cuckold's friend in response to the Cuckold's threats: Don't start anything man.
I'm not trying to drop my bones.