"Mi casa es su casa" or "mi casa es tu casa" (more informal) is Spanish for "My house is your house".
Mi casa es su casa, bro.
by jimmybone d May 13, 2008
"Mi casa es su casa" (formal) is Spanish for "My house is your house" a common saying to invite someone into your house and allow them to make themselves at home. It also carries a implied sexual connotation of granted permission to have intercourse during your stay.
As in Atlas Shrugged(movie):

Ellis Wyatt: There are several guest rooms upstairs help yourself...(evening valedictions)...Mi casa es su casa and so on.
by wkpsahl January 04, 2014

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