Drywalling is a term that comes about due to the fact that engaging in coitus with a female who is "dry" is comparable to making love with a dry wall with a hole in it.
Papabear: "Well, that is why they call it drywalling Jimmy! However, I still commend you on having sex. Huzzah!"
"Bonny LOVES the drywalling"
"Dude, i can barely walk.. My girlfriend wanted me to do the drywalling last night and i can feel my sore cock against my trousers on every step"