[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.