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1.
To smoke with a single inhalation, a portion of marijuana through a bong, thereby ashing and emptying the entire contents of the bowl in the process.
Man, I could really go for a nice bong snap right about now.
by egypt3 August 24, 2008
 
2.
Snapping a bong is the act of clearing the bong's bowl of cashed or spent "herb" by sucking the ash down the stem into the bong water, thus preparing the bowl to be repacked.
"hey man, do a bong snap when you're done, i want to pack a green hit."
by shadow-capo September 05, 2008