The act of fucking ones girlfiend, or wife in the ass, then wiping your dick on his pillow before he comes home, and without him knowing. Usually done to someone for revenge, or out of spite.
There's two definitions of Throw Pillows.
Version #1: Throwing pillows at a slumber party, dolls lingering with stuffed animals.
Version #2: Giggity Giggity, Oh Right!! <-- Hint: Horny parents getting it on.
Refers to a particularly ugly and promiscuous girl form the middle east who could or could not have shaven her body for the entire span of her life and if ever engaged in sexual acts deserves to have the pillow case stripped off the pillow and thrown over her head like a paper bag.