its when a guy sits down on the couch and your balls hit the couch making a slaping sound
E-Dog: *sits on the couch making a claping sound*
Alex: What was that noise?
E-Dog: I just couch slap.
Alex: Oh dude you ok?
E-Dog: Yeah Im cool
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when some person slaps another persons couch.
Look at that kid over there i will give him a couch slap. Ow.