Flopshank
When your dick goes soft on you mid coitus, so you grip as far down the base as you can like you are holding a prison shank, hold the blood in your now artificially hard penis, and begin repeatedly stabbing your way into your lady's G-Spot.
"Dude, I drank and did so much blow last night, I had to give the chick I took home the ol' FLOPSHANK."