A scale of measurement where at least one of the reference points is "fwoomp"
Girl: Did you see him last night? On a fwoomp scale of 1 to fwoomp, he's like a 9.
Dude 1: Oh man, I fucked her raw, but it's okay because she was just on the rag.
Dude 2: You are so fucking stupid. On a scale of 1 to fwoomp, you score a fwoomp.