The past tense of "thwap", or to be smacked like a bitch on the chest or back of the head.
Then I reached over and thwapt him on the head
n. the imaginary sound that is heard after a blow is landed from a fist to some one's face.
Did you hear that? Mark just thwapt Jeff in the face
when two girls drink cum and blood and swap it in their mouths running it all over there tongues and shit...yeah bitchs keep thwaptin in the new world!
An onomatopoeia, representing the sound of wet flesh moving loosely.