I'll shit 'em - You're full of hot air, and I'm gonna prove it by doing the

You're full of hot air, and I'm gonna prove it by doing the job and then giving you a surprise poop.

You said you'd finish the project by Friday? I'll shit 'em and be done by lunch.

You brag about your skills? I'll shit 'em and make you eat your words.

You said you'd beat me in the race? I'll shit 'em and leave you in the dust.