I'm not actually sure what's going on here, but based on the scene, I speculate it's one of the following:
- Felicity just raised the ante by $5 and Samantha countered by throwing in the bike that Santa brought her this past Christmas.
- They're counting their drug money.
- They're pooling their resources so they can flee the country tonight.
- They're counting their night's earnings and are about to give their pimp, Curious George, his cut. You can't see it, but C. George is sitting in a chair in the corner, wearing a sombrero, bandanna, shiny necklace, and poncho. (I am not making this up.)