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1.
Short for 'Had To Be There' When relating a story, sometimes you realize after telling it that the effect had to be witnessed in person to be fully understood.
Dave: "John didn't really seem to think my story of spilling the beer was funny."

Debbie: "Hey, HTBT I guess".
by Whos-y-whatsit June 08, 2007
 
2.
pronounced 'aich-tabeetee'
acronym for 'had to be there'
oh i guess you kind of htbt
by ASSMCL March 01, 2011
 
3.
A really in word used by dumbass bimbos, meaning 'had to be there'. Commonly used by the said trampy whores in order to make other people feel like they've missed out on something amazingly amusing, when in reality, the funny event was just lame and stupid.
(Laughs from the in crowd) *Approach*
Normal person: Hey, what's so funny?
*Grimaces*
Bimbos: HTBT.
by normal February 13, 2004