A Slammie is similar to a Slampiece, only much cuter.
Sure, you love slamming her, but she's on a completely different level than a simple Slampiece.
The important thing is she's a sexual dynamo that you can still show off in public.
Read: She's fine as hell.
Bro 1: "Bro, did you see that fine slam piece Devin was bangin on the bar last night?"
Bro 2: "Listen Bro, that bitch ain't no Slampiece, I mean look at her face... Devin was definitely taking a Slammie to town on that bar, not a Slampiece. You don't even deserve to be called a Bro, Bro."