An acronym representing Sex Now or Leave.
Originally used on www.Omegle.com an online chat site, teens use this term before asking for the asl of a person as a way to ensure maximum time to 'CYBURR' their counterpart.
(the origin of the SnL seems to come from a cupcake factory North of the United states, where many taboo events unfolded)
Person A: SnL?
Person B: YESSS I R TEH CYBUR YOUU!! ASL??
Person A: YAY IM ....