1 definition by BFFSFOREV
a situation where during a 3sum, usually MFM. One male has sex with the female while the other male puts his penis in her mouth and gags her. ie. gag & shag.
BOB: "Dude i heard you and John gagshagged Jessica last night"
TOM: "Yeah, that whore loves the gagshag."
TOM: "Yeah, that whore loves the gagshag."
by BFFSFOREV May 13, 2009