Taken from comfortable, meaning when you make an extemely beautiful significant other seem less attractive, usually by means of weight gain untill you can still find them sexy, but most others would not. At this point your level of comfort increases because you don't worry about them cheating/ leaving as much, plus you've got someone soft to hold on to at night.
Friend: Hey, aren't you dating Attmattulah? She really let herself go...

Seth: Naw, she's just comftable.

Friend: I remember when I first saw her, she was sexy as hell...

Seth: And...

Friend: Now she's kinda fat, I wouldn't fuck her with Brian's dick.

Seth: YEEAAAHHH ! ! !
by Helljin January 13, 2006
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