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When you blow a load straight into someone's navel so their belly button becomes a sewer of cum. Only works if they have an inny and are ready to be grossed out.
My cousin did this to my sister during lunch and she cried for 10 minutes.
He pulled out right in front of the whole class and made me laugh so hard I peed my pants.
I did this to my mom and she threatened to cut off my balls.