(slang) Crazy; unstable.

simple past tense and past participle of bug

(computing) Affected by a bug (computer error). / Containing a bug (interceptive listening device).

plural of Bug

present participle of bug out

Any of several species of African assassin bugs, especially Platymeris rhadamanthus.

(jargon) The practice of engaging in anal sex with the deliberate intention of contracting HIV.

(gay slang) A man who practises bug-chasing.

A firefly.

(computing) A design flaw in computer systems that represented years as two digits (e.g. 84 for 1984), which could cause date calculations to fail if they involved years later than 1999.