A combination of the words "wee" and "retard." Coined by a Los Angeles teenager in reference to his little sister's friends. Often used in a redundant context, such as "little weetard" or "stupid weetard."
My sister is having all her stupidlittle friends over for a weetard party, wanna crash it?
Person 1: We've been teaching your little brother his long division for 2 hours already. Why can't he understand us?
Person 2: He's a wittle weetarded
Person 1: What did you just say?
Person 3: She said he was retarded Person 1: Oh