Wang in wang sex.
Contrasted from docking
(which is pedestrian in comparison), wormholing involves actually inserting the penis into the urethra of another penis.
Oh dear God no. Fuck! No, please don't. Oh goddamn, oh goddammit! (wormhole)
A heterosexual wormhole
Guy: Can I go in the other hole?
Girl: Well, I really don't like anal se...
Guy: No, the other OTHER hole.
Girl: Oh. Well. Yeah, let's do that.