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1.) a lonely female with no self-respect who willingly subjects herself to the marginal attention of married men
2.) enemy to the institution of marriage
3.) an example of female energy used for evil

4.) a married man's co-conspirator
5.) the puppet a married man keeps in his closet and pulls out only at night and only when no one else is around to witness its existance
6.) one who will never experience real romantic love, and seemingly has no desire for it

7.) a woman with no value other than that of sexual gratification
Recently, we have seen many famous men's lives and marriages come to ruin as a result of their relationships with a mistress(es).
by I said... February 04, 2010
Happy St. Patties Day!
The slut who sleeps around with other people's boyfriends!!!
"Allison the mistress is such a wh-oore, I can't believe she slept with my boyfriend, Phil, and did other stuff..." - Teri-Lynn
by RANDOM@BROCKU November 17, 2006
Happy St. Patties Day!
A woman other than his wife with whom a married man has an ongoing sexual relationship
by Allison July 15, 2003
Happy St. Patties Day!
1. noun; In B/D and S/M, the woman who is dominant.
2. noun; Proper title of dominant woman in B/D and S/M relationship.
1. I am a dominant Mistress who is looking for a submissive slave to play with.
2. My name is Mistress Tiffany.
by J June 04, 2003
Happy St. Patties Day!
Spare pussy to have when your wife or girlfriend is either on the rag or just not in the mood to straddle the cock. Traditionally a popular stress reliever in France, which might explain why they rarely wage wars these days.
After my wife tried the old "I have a headache" tactic for avoiding sex, I hopped over to the other side of town where my mistress gladly spread her legs for me.
by urban pervert October 31, 2003
Happy St. Patties Day!