Stands for "I'm in the mood to fuck." Usually implies that you, or person using acronym, is horny and down to get crazy.
"Damn, that guy looks so hot right now! Ughh I'm ITMTF!!"
"That girl turns me on, I'm definitely ITMTF."
"That girl turns me on, I'm definitely ITMTF."
by amirror October 11, 2011
Get the ITMTFmug.