have mind in the gutter

have one's mind in the gutter

 and have got one's mind in the gutter
Fig. tending to think of or say things that are obscene. Tiffany has her mind in the gutter. That's why she laughs at all that dirty stuff. Why do you tell so many dirty jokes? Do you always have your mind in the gutter.
See also: gutter, have, mind
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