What is Lackass?
1.
A person, male or female, who has no ass.
She had a nice rack, but she had a bad case of lackass.
See
2.
One Who Isn't Getting Any "Ass"
Therefore, Lacking "Ass".
Gangsta 1: That Little Nerd Over There Isn't Getting Any
Gangsta 2: What A Lackass.
Gangsta 1: Fo'sho Nigga.
See