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Top definition
UMBFF
ULTRA
.
MEGA
. BEST. FRIEND.
FOREVER
.
is
leuheya
your
umbff
?
duhh
she’s the best.
by
umbffben
April 28, 2019
Get a
UMBFF
mug for your cat Callisto.
2
Umbff
Ultimate
mega
best friend forever
Morgan
is my
umbff
.
by
Mello83420
August 02, 2017
Get a
Umbff
mug for your guy Beatrix.