The Sexual act of two women, (or possibly men, or a combination of the two) providing a simultaneous blow job on a lucky recipient, usually with each performer sharing a side of the penis. The performers can also 'make out' while the penis is thrusted in between their mouths, this is also sometimes referred to as 'The Rude Frenchman'.
SAM: "Hey Steve, I noticed that both Becky and Tara were all over you at that party last night, so I was wondering...who did you fuck?"
STEVE: "Neither, I brought them both back to my apartment and settled for a Blow Job Sandwich."
SAM: "You call that settling?"