FLEB

Noun; a reclusive person, someone who does not go out very often, a person who could stay at home all day long and not talk to a single person and be happy.
Adj; Purposely not answering phone calls and avoiding people.

"That guy will never come out to drink with us, he is a fleb."
"I plan on flebbing around the house this weekend so don't bother calling me"