To ruin or totally fail at an action or procedure which requires the lowest ammount of human intelligence
"you realy knibbsed that up!" or "you are such a knibbs!"
by official word guy 2k14 December 04, 2014
To have loads of dandruff it looks likes it is snowing
there is tonnes of knibbs out side
by loplewloplop November 30, 2015