Thickshake Thirds
theres Fresh First, Sloppy Seconds then Thickshake Thirds. Its used to describe what a womans vagina would feel like when your the third guy in line to fuck her.
Mr B to Mr P, "hey shes hot i think i'll get in for Fresh First you can have Sloppy Seconds Mr P"

Mr P to Mr B "like fuck Mr B im getting Fresh First and Sloppy Seconds your getting Thickshake Thirds!!"