In French argot, Roberts are slang for giant tits. As in boobs larger than one hand can take care of satisfactorily. Usually causes slight unease in the partner for not knowing what to do/how to handle and please them.
Man, her Roberts were so humongous, while I fucked her from behind I felt so inept when I tried to massage her boobs at the same time - they were too enormous!
by Notmehim August 10, 2023