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Bitch goes into his closet and changes into arm length gloves JUST to do that pose and express utter discontent towards you /j
Alternatively my /srs idea for it is, well, he's a venetian jester! He could very much use miming to imply the presence of arms. Bitch sliding his fingers across his nonexistent arm; Audience gets the message. Arms. Bitch crosses them dramatically. Its a weird looking pose as his gloves aren't resting on anything and just floating about, even doing the finger tap of a really angry mother. But his audience knows what he's trying to imply. I could draw it when I muster the energy. But think of Mordecai slowly folding his arms into a cross; that's him.
I genuinely want to know if it can be done.