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Professional rock climber Alex Honnold has found himself in some sh**ty situations in his death-defying line of work ... and he tells Hasan Minhaj what it's like when you're scaling a mountain -- and nature calls.
When you gotta go, you gotta go ... that was pretty much Alex's motto when Hasan asked him how he goes to the bathroom while climbing.
According to Alex ... you just go!
In fact .