An X-rated film taken by a man of his wife or girlfriend having sex with another man with his permission
Your wife is hot, do you have any stag films?
by SecretPlayWife June 12, 2018
Made famous by Jack Warden ("Pops") in critically-acclaimed Dirty Work: "Nah, back when I was in the STAG films."
by My name? It's Marc; with a "c" February 1, 2008