look up any word, like bukkake:
 
1.
HGDT - an abbreviation of saying hello.

To indirectly ask how someone is, without any need to respond.

To let them know you are thinking of them.

Today you are happy it is thursday.
Andrew: Oh hi,

HGDTSB (happy god damn thursday + persons initials)

Sarah: HGDTAB
by Brady1978 September 23, 2011