The term monkey's uncle, most notably seen in the idiom "(Well,) I'll be a monkey's uncle", is used to express complete surprise, amazement or disbelief.
John: "Jessica broke up with Tommy can you belive that"
A woman who leaves relationships to immediately be in another relationship because she was already laying the groundwork if not already outright cheating so that she has a soft place to land, and never really being single ever. Much like the monkey in the jungle, swings from tree to tree, the monkey never lets go of one branch until its paw is firmly grabbing the other, ie; monkey whore
She’ll never be alone, she’s a monkey whore, she’s alwaysgonna have a dude waiting