Vagina. Arby’s #1 combo is supposed to be roast beef, it’s a variant of beef curtain. First used by Onisions ex wife Sky in a tweet , to describe a situation where Onisions current spouse Kai sent a photo to a minor.
Wait waitwait are you telling me that your spouse sent pictures of their Arby’s #1 to a minor.
When a women has partaken in sexual activity too often and is left with pussy lips that can be compared to an Arby's roast beef sandwich
Man 1 "dude I think I'm going to try and sleep with Jessica."
Man 2 " nah man I heard she's got an Arby's number 2."
Man 1 "forget it that's disgusting."