chucking an 's'
When a show off chick who knows shes skinny, or has really hot lips or something, starts going 'OMG I am soooo fat,' -OR- 'I need to put more weight on.' or starts complaining about collegen injections and crap.
Sam: Jeez Liz, you make me seem so fat!!
Liz: Shes chucking an 's', YET AGAIN!!!
Liz: Shes chucking an 's', YET AGAIN!!!