What does umk mean?
just what it sounds like.(uh-m-kay) it basically is the putting together of the two words uhm and okay to form umk. like "you're beautiful""umk, you're a creep"
From what I know, the letters UMK can stand for Ultimate Mortal Kombat in games and it can also mean u might know in texting. The initials can also stand for a learning institute or office.