go off (one's) dot

To become crazy or mentally unsound; to become extremely foolish or foolhardy. I'm going to go off my dot if I have to hear that blasted song once more! I think Jane's grandmother has gone off her dot lately. You must have gone off your dot if you think that's a good idea!

See also: dot, go, off

See also:

go off (one's) rocker
lose (one's) mind
lose one's mind
lose your mind
lose one's buttons
lose (one's) buttons
lose all one's marbles
lose marbles
lose one's marbles
lose your marbles

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