U-Grime is the category beneath grime and therefore given a new title.

Derived from the German U-boats.

Was required as too many people were fitting into the class above and so the Less attractive ladies are fitted in to this new one.
Jonny : That girl i got with was grime FML , In the same range as the flith
Patrick : No mate the filth is now "U-Grime"
by Patrick ED43 December 12, 2009
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