When a man has sex with his partner who has very recently had sex with someone else.
Example:

Friend 1: Your wife was cheating on you?
Friend 2: Worse, I found out later that one time she had sex with her boss at work and then came home and we had sex.
Friend 1: Dude! You were stirring vanilla!
by ryeprotagonist October 3, 2013
Get the stirring vanilla mug.
To have sex with a woman so soon after she fucked someone else that there's still cum inside her. Kinda like sloppy seconds.
You mean to tell me you had sex with Julia Friday afternoon? Awww man - I guess I was stirring the vanilla later that evening.
by Jacaranda May 3, 2007
Get the Stirring the Vanilla mug.
A vanilla stir stick is a hard cock that has sperm residue all over it from cumming in a vagina. Especially common when giving a cream pie.
Hey T... you really like sucking on my vanilla stir stick after I cum all up in you.

Yeah D, I love the taste of your sperm
by Big truck, small dick November 2, 2017
Get the vanilla stir stick mug.