Top definition
a deefus is someone who looks like a retarded rat/beaver mix, and often has the IQ level similar to that of a rock. they often have smart friends, who accuse them of being the deefus, however there is truly only one deefus in every relationship.
John: Bro did you see that guy? You can tell he's the deefus.

Amy: What a deefus!
by clv0303 August 24, 2017
Get the mug
Get a deefus mug for your brother-in-law Abdul.
buy the domain for your foodie site