Top Definition
an acronym meaning 'mean(s) the world to me'.
used a lot on social networking site bebo, and occasionally on rival sites facebook and myspace.

see also: umtwtm
bebo profile 1: i'm 4teen and my friend &+ family mtwtm

bebo profile 2: i love my best friend natasha, she mtwtm tbh. i don't know what i'd do without her ♥
by caiface December 13, 2009
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