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Tmvu is a quick cute way to say I love you or that I care about you. Tmvu stacked vertically is I <3 u. You mostly in text just like ily.
Such as

D.A.S.B.~Tmvu wifey I love you!
S.A.N.G.~ Awww tmvu babe (:
by DASB July 15, 2010