to "bob" someone (like your uncle), which means completely owning or sweeping them off their feet, or in explicit way attacking them with, bitch-slapping him (or clench his face
inbetween) a nice pair of bobs. This term is used mostly by
indian people, referring to boobs as part of the joke.
The trend has it that lines like these are replacing unexciting "your ... mother" jokes in
multiplayer gaming.