Someone who people forget are in the conversation because they don't talk, then when they do it usually comes off as gay or weird. They live extremely dull lives because of the hatred to trying new things and hanging out with people.
They are usually extremely pale due to the lack of interaction with civilization and have been friend zoned by every love interest ever (if the socially fucktarded has talked to one).
1. Dude Jared is so socially fucktarded, I tried talking to him the other day, and he just responded with different fruit.
2. Dude Houston is such a social fucktard, I havn't seen him outside in 2 months.