A derogatory nickname for people obsessed with all things british, including but not limited to Doctor Who, The Royal Wedding and The Mighty Boosh.
Bill: "Man, Ian sure has been obsessed with Sherlock Holmes"

Ray: "Yeah, he's such a Union Jack"
by CINNAMINBUNNS October 11, 2011
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When one dips their balls in a mixture of shit and tea much like a tea bag, then another proceeds to jack off said person who dipped their balls in the mixture.
Bruv, Charles was well Union-Jacked on the weekend
by DoughBoy01 December 10, 2021
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Union Jack has come out to greet us today! He is huge!
by Hickery Doc April 30, 2003
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1. Where Alex goes to urinate.

2. The most hilarious joke in the world.
Peter: Alex's going to the union jacks. HA HA HA.

The Jew: God Peter's stupid.

Liam: fap fap fap
by RoryGalway February 12, 2010
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He'll ban everyone who plasy Era on graal.
The Union Jack banned Dell Melvar.
by ShoFo October 1, 2003
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