When a slut situates herself between two guys, giving her easy access to give hand jobs to both parties.
Person #1: Look at that girl over there, making a sejmis sandwich.
Person #2: Looks like both guys are gonna have a good time.
Person #2: Looks like both guys are gonna have a good time.
by madame psychosis June 18, 2011
Get the sejmis sandwichmug.