Ram is an acronym. it means r(running),a(at),m( the mouth)
It is used in a sense of hisretical loudness in a cocky belligerent manner. Mostly seen when some one is drunk, high, losing a fight, or when some is scared to actually make a ation about something and just talks.
"Yo God, you heard the cat round the corner talkin bout he gonnna get you outta here wit the burner talkin all reckless, you feel me?" "Yo son,relax.I got that. That nigga like to ram cause he won't come step up to the plate feel me"