Similar to a 'sandwich grind' seen at a nightclub with a girl and 2 guys on either side. However, a Club Sandwich involves more than 3 people.
The phrase derives from two sources; (1) traditional club sandwiches have three slices of bread instead of two, (2) it's a sandwich in a nightCLUB.
Nah, looks like she's already in a club sandwich, let's find some fresh meat
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