When something is not as good as it should be, not cooked enough, not solid enough, almost rubbery or jellolike.
Man, this pizza is flibbly, I told the guy crispy for Christs sake...
His dick was flibbly, he was having a different kind of hard time with it tonight.
1. The act when a male is intoxicated and has sexual intercourse with somebody, and half-way through, he sobers up, realising his partner's physical features represent a decomposing trout inside a balanese prostitute, and as a result the male's penis then becomes flacid.
2. Noun. A word to describe someone who is likely to cause flibblegicking.
1. "Man, after the pub I went to this chick's house, but then I totally sobered up and flibblegicked!"
2. "Dude, Sarah is a grade-A flibblegicker..."