The term refers to the boyfriend of a seemingly competent friend who has begun dedicating most of her time and energy to a guy who seems incapable of functioning on his own without excessive assistance, support and reassurance from her.
- Why did Jennifer leave the party so early? I feel like I haven't seen her in ages.
- She told me her boyfriend expressed that he didn't feel comfortable around people he hasn't known his entire life by throwing a beer bottle through Jan's parents car window so she was taking him home.
- I feel bad for her, it's like she's adopted a retarded baby.
A joke that has gone way too far as to appear totally not funny, but rather insulting instead. Very close to a sick sense of humor, except NO ONE laughs. Since the joke maker was only kidding, it's still considered humor ... just, retarded.
autistic-guy: "(enter unfunny joke here)"
normal-person: "What a retarded sense of humor"