a few ways.
1. 'eh that girl pretty.' they'll see if you... a) look, stare and
start to salivate, b) say she not pretty and look away, c) say she
not pretty but still stare.
2. 'am i fattt????' they'll see if you... a) w/o looking, u say
she's still pretty, b) u look2, say she's alright, c) laugh2 and
say she fat.
and a lot more ah... haha.