Through the pants (or TTP), was a phrase coined during the initial rise of Halo 2 multiplayer. “Through the pants” implies that your opponent just got raped to such a severe and embarrassing extend that the removal of pants was not required, for either party present during the commission of said rapeage.
“Curtis, can you see me teabagging your corpse? I know you like it, all rough like this. Through the pants!”