Usually practiced by those with oculolinctus (or eyeball-licking fetishism).
There's actually recently been some controversy about it cause it can, like, spread diseases and really fuck up your eyeball and shit.
Tim: What, why? She's so hawt.
Derek: Yeah, but we were messing around last night and she started worming me.
Tim: Gross, can't you get conjuctivitis from that or something?
Derek: And it could have totally given me a corneal ulcer.
The phrase could also be sent silently via wriggling the index finger in the direction of a potential mating partner.
Dave: She's mega hot.
Fred: I'll give Worming on her a go!!
Remainder of friends cheer and shout "WORM ON"!