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1.
When a person is trying has a hidden motive or hidden objective with another person secretely.
I think he has ulterior motives with me, just trying to get inside of my pants.
by Chloe98 February 06, 2012
 
2.
Female tactic in Domestic Warfare.
The 'Ulterior Motive' is an oft used tactic, by females, in the theatre of domestic warfare.
by Gamblers Anonymous November 16, 2006