One who is stealthy like a ninja, jumping from one ass to another (usually raping them, usually a gay ninja too).
They could be a figurative assninja, or a real gay ass ninja!
The latter would dress up as a ninja, with stars and everything, and perform ass sex with kunais, advanced forms of taijutsu, ninjutsu and genjutsu.
They are to be feared when they possess a sharingan!
John walked oppenlegged, ass bleeding out of his bedroom this morning. He had a swarm of assninja's on his back all night, and won't be able to sit for a month now!
Otherwise known as the taint or the chode, assticles typically occur in men of advanced age. After gravity has taken its toll on the scrotum, the advanced stretching begins to affect the anus. Eventually they become one.
Harold was in the bathroom the other day battling with some troubling constipation. To his surprise his scrotum lapped delicately at the water. He called to his wife. "Gertrude!"
"What is it Harold" she replied.
"Get in here and tell me why my balls are in the water" he gasped.
"OMG Harold!" she exclaimed. "You have assticles you filthy old fucker!"
The following are assicons:
(_!_) A regular ass
(__!__) A fat ass
(!) A tight ass
(_*_) A sore ass
{_!_} A swishy ass
(_o_) An ass that's been around
(_x_) Kiss my ass
(_X_) Leave my ass alone (_zzz_) Tired ass!
(_E=mc2_) Smart ass (_$_) Money coming out of his ass
(_?_) Dumb Ass