the insertion of someone's testicles into another person's mouth, who then "swishes" them around with their tongue (usually in a circular motion).
The slumber party was a success only after the "drunken" teenager gave everyone a sweaty swisher in their sleep.
similar to sideboob, sideball is simply the view of one side of a guy's ballsack.
holy shit, i swear to God i just saw that old guy's sideball!
WTF!?!? i thought that movie was censored, but i definitely saw some sideball!
paul enjoys looking at my sideball.