What is Lashy?
1.
-verb 1. "To do a..." To plunder, thieve or waylay the telephone number/email/other source of contact of the mother of a friend or other individual, and covertly plot, joke, scheme, or otherwise clandestinely communicate with said friend or individual's mother, whilst said friend or individual is unaware.
"My friend pulled a Lashy yesterday, and now my friend talks to my mother more than me!"
See