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When you’re laughing so hard you’re also getting a hard-on because the situation is absurd and you’re too stupid to notice.
I saw my dad fall into a pool wearing only socks and a belt. I laughed so hard I got a boner.
My friend told a joke about a chicken that had a PhD. I laughed so hard I peed my pants.
At the party, the guy next to me kept talking about his ex like she was a serial killer. I laughed so hard I had to leave the room.