ITYFM Share definition Flag Acronym for "I Think You Failed Math" or "I Think You Fail at Math" "I skipped two of my six classes today, but the three I did go to were totally worth it." "Uh, dude, ITYFM." ITYFM by czyo March 2, 2009 0 0 Get merch Get the ITYFM mug. Buy Now — $32.95 See more merch