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1.
The act of replacing certain vowels in profane language with the letter "A". Commonly used to convey the meaning of profanity without saying the actual word and feeling naughty.

Also makes people think that you are from Boston.
Example of the use of Profanulism:

"Man, after i saw that ass I facked that batch so hard in her passy... She was like, 'Damn, you have a huge cack.' "
by GeoffWilkersonTheSeventh May 08, 2013