It is when you poop out cum after receiving anal sex, bareback, from another guy. The only thing coming out of your bung hole is cum.
Man, did you see the toilet after Doug was done using it ? He must of got laid because it was full of guyarrhea.
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Cross between "guy" and "diarrhea".
Similar to broseph, duderonomy, bromeo and others.
"Hey guyarrhea, what's going on tonight?"