Nah man he's with Julia... he's totally whipped
*girl standing next to them* You're just jealous you're not getting any ass
Informally: If your girlfriend asserts A, then you have to do B
This isn't to say you can't do B without your girlfriend asserting A. It is just to say that when she asserts A that you have no option but to do B, whatever A and B are.
The reason why pussy doesn't enter into the definition above is because doing B does not entail the affirmation of pussy acquisition. In addition, doing B does not necessarily entail anything further.
Damien: Okay, I'll paint the walls /Whipped
Jess: You're getting a fat, go to the gym more often
Saul: Okay, I'll go to the gym more often /Whipped
GIIIIRRRLLLFFRRIEND: Oh heeeellll nawww, y'all best be gettin' a job you broke ass niggah!
Eddie: OH-KAY /Whipped