Aaron Pico admits he felt bad after OBLITERATING his opponent with a crushing right hand at Bellator 252 on Thursday -- and later apologized to the guy for talking trash after the knockout.
If you haven't seen the video yet ... BUCKLE UP!!
Pico just destroyed John de Jesus with an overhand right in the 2nd round of their featherweight bout -- sending his opponent crumbling to the ground, where Pico continued to fire off shot after shot until the ref stopped the fight.
In the moment after the knockout, Pico was so fired up, he started talking trash to JDJ while he was still laid out on the mat.