What is Knickerknocker?
1.
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 ...
See