1.) The actions of a group of people, where when one says or does something funny, that all persons in the group laugh uncontrolably, and are unable to control the laughter among themselves for several minutes.
2.) An almost magical effect among a group of people where all in the group seem to understand the same comedic implications.
At a party: Sam : Yo George where did bettygo ?
George: Oh, she's at the table over there viral snickering with the marketing group.
A guy who covertly steals womans underwear off the clothesline for his sexual pleasure and "usually" has been found out ..Similar to the "Snowdropper"
Mark:Hey Peter did you hear mad Davie's been doing his rounds again last night ..?
Peter:Who the knickerknocker ..?
Mark:"laughter" Aye the very one ...
Nancy: It's really muggy today, I think I might go for a knickerjog!
Gerrard: Really, what about your boobs? Won't they bounce up and down like kangaroos on space hoppers?
Nancy: No that's fine, I actually quite like it, and it stops me getting nipple rub!