someone who writes Urban Dictionary definitions about people in their school and who the hate/like.
Person 1: "lets write an urban dictionary definition about caleb LOL!"
Person 2: "stfu retard"
Cognitive disability based on age. Often used as an offensive word to describe someone stupid or ignorant.
“OMG! They are such a retard.”
Someone who is perfectly capable of accomplishing a task but fucks it up anyway.
John, you put the roof shingles on backwards. Stop being a retard.
Smart Person: You're retarded.
14 Y/o white girl: OMG OMG OPMG ABLEIST