A accidental fart is when you release a fart accidentally
Malcom: *Farts loudly in class*
Teacher: Malcom if you fart like that one more time you’re getting detention
Malcom: Sorry teacher
Malcom: *Farts*
Teacher: That’s it, detention
Malcom: That one was wasn’t my fault. It was an accidental fart, I swear
Teacher: Ok fine, I’ll let that one slide