In this sex move you will require a tin of Skoal (any flavor will do). Begin by packing a delightfully fat chew in your bottom lip. Proceed to have sex with your girlfriend, significant other, hooker, etc. Remove your penis for just a moment while you dip-spit on it. Now switch the insertion point from vaginal to oral. This will result in quite a surprise for the receiver.
"I pulled the Skoal Switcharoo on Tonya yesterday so she dumped me. Lets go dip."