Top Definition
ACU
The Army Combat Uniform. Is the new uniform that the U.S. Army has adopted to replace the current Battle Dress Uniform.
That Soldier was just issued some new ACUs.
by butthorn October 29, 2005
1 more definition
ACU
Ass Crack Ugly. A school for ugly girls.
That chick must have graduated Magna Cum Laude from ACU.
by Skiperoo Nasty May 10, 2010

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