When someone of the male species will do anything a female friend asks of him just because she has tits. Not necessarily because he'll get any action, but just due to the simple fact that she has breasts.
Desirae (who has huge tits): "Leo, will you watch my kid so I can go shopping?"
Leo: "Sure, I'll pick him up for you from the store so you can get the maximum amount of shopping done".
Desirae (who has huge tits): "Carlo, can you hold both my kids at the same time while I do my make up and get ready?"
Carlo: "Sure thing, Desirae".
Leo & Carlo are both friend whipped.