The act of being completely smeared in cum, to the point when you walk around others they seem alarmed and can notice your presence from a mile away. The combination of smell and attitude from a CumCastle is so bad that many try to stay as far away as possible from one and even use the word as a form of insult.
Luke just came on a girl and now she’s pissed calling him a CumCastle.
Toro is at it again look at him jerking off in his bed, smh what a CumCastle.

Tomi Just had another wet dream... #CumCastle activity.
by Banfield November 12, 2022
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