Honestly, there seem to be a lot of people looking for this word when we've got a pretty good circumstantial case that Klingons just don't have this as a distinct part of their courtship behaviours.
We do have {chop} "bite" as well as {rem} "suck" (compare the English slang term "sucking face"), which should pretty much cover the requisite actions beyond {wuSDu'chaj HotchuqmoH}.