This phrase has a very similar meaning as the phrase brother from another mother except not quite as familiar. The phrase is used mostly to describe close friends. It pokes a little fun at your buddies while at the same time conveying friendship and kinship. If the guys are life-long friends, use "brother from another mother" but if they're close buddies or you just want to joke around, use "bama from another gramma". You have to say it like it rhymes.
When someone says something profoundly stupid with the intention of getting a response, only to have the reaction fall short. That is when you simply reply, "Gimme Dem."
Tyler: "Yo dude I stuck two fingers in and she was like SHIBBY!! haha too bad it was only her butt, right?"
When you order Microsoft points and it takes a long time to finalize the transfer and you are impatient. Usually involves lots of raging and profanity.
Example 1
"GIMME MY POINTS, FUCKIN' SHIT!"
Example 2
'Did you download so-and-so yet?'
"No, I'm waiting for the points to transfer. FUCKING GIMME MY POINTS! FUCK!"