Cut the brown wire

To excrete wind, or fart.

In extreme cases, to go for a dump / soil one's self.

Taken from Lethal Weapon:

Murtaugh: "Come on, man, come on!"
Riggs: "I dunno, what one should I cut"
Murtaugh: "I don't know! Cut the brown wire!"
Riggs: "OK, here goes......"
Riggs: *parp*

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cutting the wire

To finish something close to it's deadline

Bryant was cutting the wire on his final project, he wasn't sure he was going to finish in time.