mi casa su casa 

spanish for 'my house is your house'.

In the movie pulp fiction:

Vincent: Thank you. Mind if I shoot it up here?
Lance: Hey, mi casa su casa.

This happens when vincent goes to buy his stash before his date with Mia Wallace

mi casa su casa by Aman Rai December 29, 2006

mi casa es su casa 

"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.

mi casa es su casa by jimmybone d May 13, 2008

Mi casa es su casa 

"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.

Mi casa es su casa by wkpsahl January 4, 2014