a small motor vehicle, typically with an open top

a golf buggy

a light folding chair on wheels, in which a baby or young child can be pushed along

her two younger children were in a buggy

infested with bugs

we pressed on through the buggy undergrowth

(of a computer program or system) faulty in operation

the software is infuriatingly slow and buggy

(of a person) irrational or out of touch with reality

I would go totally buggy if I was stuck in an office