A sharp rapping with the palm of the hand on the back of someone's head. A thop is commonly used when the thoppee has said or done something illogical or stupid, or it can be used as a threat.
'If you don't get yo ass here right now I'll thop you into next week!'
Replaces the word "Though, Tho, thop', or any connetation of the word." Also it can be tag-a-longed at the end of any sentence or word and make perfect sense, not to even be questioned.
Also it may replace a word that may seem obvious to its actual meaning.
Man you got so jeff'd last night, not as bad as miles thop.