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1 definition by
katana90
63
A slang way of saying
down syndrome
, usually used to insult someone. Derived from the fact that down syndrome is caused by 3,
21
chromosomes
.
(3*21=63).
Wow,
just look
at
connor
,
that kid
fails so much he gotta be a 63
by
katana90
March 30, 2011
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Get the
63
mug.