Justin Bieber NEEDS AN ASS-KICKIN' ... Says Ex-NFL Star

Justin Bieber shouldn't go to jail for egging his neighbor's house last week ... but he DOES need someone to BEAT HIS ASS ... so says ex-NFL player Jordan Babineaux.

With Justin's neighbor pushing for incarceration, we asked the former Seattle Seahawks safety how JB should be punished for allegedly causing $20k in damage to his neighbor's home.

Jordan's response ... CLASSIC.

"I'd kick his little ass," Jordan said ... "I'd give him a wedgie and throw him in the pool."

There's more -- it's awesome.