When one girl is giving the fresh cum from her mouth to another girl’s mouth. Cum swap is usually part of threesome sex, when a man cums directly in the mouth of one girl, and then she is kissing with the other girl, with the mouth full of semen. Then they both enjoy the taste of the fresh jizz, and both can swallow their portion of the load.
Common misspells: Cum Sawp, Cum Spaw, Cum Sapw, Cim Swap, Cun Swap