A Grandma that isn't a senior citizen yet so she doesn't fit the classic Grandma mold. She is a younger, hotter, more energetic fun loving Grandma because she hasn't accepted the fact that she is a grown up yet.
Function: noun. Gamma is used to describe the ability some women have to attract men with practically no effort. Much like the Hulk in the comics absorbed gamma rays from a gamma bomb that transformed him into a raging monster, this woman enters a bar and absorbs all the attention of the men in the bar, transforming her into the trophy of the night. Any guy who leaves with her has conquered the beast and deserves the respect of all other men.
Damn, did you see that chick who walked into the bar. Every guy has been hitting on her; her gamma is unreal!
a young white person (offen middle class) who dress's and talks like a urban street black man in a over the top manner, they try so hard that they irratate everyone.
A generally useless person or even worse. Usually applied to males and referring to their lack of common sense. There are Alpha males, Beta males and Gammas.