The act of someone inserting their penis into another persons anus while the person on the receiving end of the deal proceeds to defecate onto the giving persons schlong.
Did you hear that Tristan and Tegan did a toxic barrel the other day ! ?
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When the other person defacates onto a shlong which is soft so it misses and causes a mess on the floor to clean up
Lil Pump: Hey bro did you see that clip of famous soundcloud rapper Pinomin getting an Elite Toxic Barrel? His micro PP couldn't handle it