Top Definition
When a woman's shoulder blades are squeezed together, making a canal that is then fucked.
That girl was awesome, she let me backfuck her.
by Wordpioneer October 11, 2014
Having sex with an obese person by thrusting one's penis between folds of their back fat (the back being the most unfuckable part of the human body).
Hey dude what'd you do last night with the fat chick from that party?

I totally backfucked her, fuckin' insane.
by HimInMeDickIt December 06, 2009
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