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Mouse in the house is when your penis is too small to have sex with a girl, so for her pleasure, you tie the tail of the mouse to your small penis and have sex with her.
Dude last night I gave my girl a mouse in the house, it was rad.
by Tusen2KxX December 05, 2017
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When you're suspicious or know that your gf/wife is cheating on you with another man. Dick = Mouse, Vagina = House
Bro: Yo man I just saw your wife out with this dude and kissing and hugging!!!

Capt'n: Dammit man! I have a Mouse in the House.
by Dudeyobruh July 19, 2017
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