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2.
Acronym for "God Damned It's Monday"
Used to express discontent in knowing that another work week has begun.
GDIM, I guess it's time for me to get back to the old folks' home and wipe their buttoms for a hourly wage of four dollars.
by SimplyOnFire November 19, 2006
 
1.
God Damn Its Monday, because you know you really hate them.

Contrary to TGIF.
"Wake up Chris! Weekend is over, got to go to work!"
"Oh noooo.. GDIM!"
by Estepario October 13, 2008