Sheila Broflovski is Kyle Broflovski's mother and the adoptive mother of Ike Broflovski. She is frequently despised and insulted by Cartman, who calls her a 'bitch' as she usually spoils his misguided fun. In fact, he has even created a song to make fun of her entitled 'Kyle's Mom's a Bitch'. She is the central antagonist of South Park: Bigger, Longer & Uncut. Upon hearing of anything she finds offensive, Sheila exclaims 'What, what, what!', and often starts something up about it. Cartman once noted this happens usually once a month, demanding to know why at the exact same time of the month, she always gets irritated by something, and he always ends up getting screwed by it. Her best-known protests are probably the ones connected to the Terrance and Phillip show. (Source: Fandom.com, CC BY-SA)