= Y =
[Usenet: very common] Abbreviation: You Have
Been Trolled (see troll, sense 1). Especially used in
"YHBT. YHL. HAND.", which is widely understood to expand to
"You Have Been Trolled. You Have Lost. Have A Nice Day". You
are quite likely to see this if you respond incautiously to
a flame-provoking post that was obviously floated as sucker bait.
--The Jargon File version 4.3.1, ed. ESR, autonoded by rescdsk.