Short for Amateur Cabaret. A generally derogatory term in the UK bellydance scene, where cabaret is the first style attempted by most beginners, and usually performed very badly by first-time performers. It is also known as "Teeth, Tits and Tinsel", as those are the defining features of an over-enthusiastic but very untalented first-time bellydancer.
"Did you see Wendy at that show on Saturday? Oh my god, she was classic Am-Cab!"