What does UMBJ mean?

You Must Be Joking



Other definitions of UMBJ:

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How to use the term UMBJ:

There are no example uses of UMBJ at this time. We would greatly appreciate your contribution if you would like to submit your own!


More slang terms:

KLM

KLM

Koninklijke Luchtvaart Maatschappij (Royal Dutch Airlines)

SMAW

SMAW

Shielded Metal Arc Welding

ODST

ODST

Orbital Drop Shock Trooper (Gaming)