A member of the tea party who is also a hillbilly. Teabillies are often angry, ignorant, god-fearin', bible thumpin', science-denyin', gun-totin', GOP-talkin'-point-parrotin' racist homophobic misogynists. Highly susceptible to Obama derangement syndrome.
A tab can mean acid but it can also mean tabby cat as in tabby pussy and illy means flash, cool, quirky, different so put them together and you get tabilly a pussy on acid that's flash and cool