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1.
mht
noun: acronym: mass holiday text. An informal, non-personalized text message that is sent to multiple recipients for the purpose of wishing them a happy holiday.
Happy Thanksgiving, Happy New Year, Merry Christmas, Happy Kwanza, Happy Memorial Day, Happy Labor Day, and any other mass holiday text that whips you throughout a holiday. It's best not to respond to these messages.

My family on Thanksgiving: "Wow, you're quite the popular one today."

Me: "Nope. I'm just getting the usual mht's. Let's just get back to carving this turkey."
by baber9 November 22, 2007
 
2.
MHT
Mutual head time

They hook you up with head so
You hook them up with a similar or greater amount
Applies to both male and/or female
Jason:So Pam was hooking me up so good I gave her some MHT

Freddy:Damn that must be good
___
Rachel: Ross ate me out so I had to give him at least MHT
by Mr.Clarke May 23, 2010