When you have eaten something dodgy or drank too much and your shits turn into liquid. When you go to relieve yourself, your sphincter only opens a tiny amount before the liquid shit starts to squirt out in a narrow beam - This is a 'laser shit'.
"Hey Dave, what's up with you mate?"
"aaah mate I ate some dodgy street food last night and im suffering from a severe case of laser shits today"
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