An extremely bad chat-up line, usually used as a retaliation to some pervy guy who is hitting on you. Gonatokamorkins never make any sense, and can often sound quite dodgy. Basically, they are there to take the piss out of people who actually use chat-up lines and hope to get something out of it.
What's the charge on your ion?
dude of perviness: *walks up to innocent girl* "Is that a ladder in your tights or a stairway to heaven?"
innocent girl: *turns and bats eyelashes* "Do you want to smell my loofah?"
dude: *walks away looking confused*
girls friend: "gonatokamorkin much?"