adj (chiefly British Isles) Insane; crazy, mentally deranged.
adj (chiefly US; informal in UK) Angry, annoyed.
adj (chiefly in the negative, informal) Used litotically to indicate satisfaction or approval.
adj (UK, informal) Bizarre; incredible.
adj Wildly confused or excited.
adj Extremely foolish or unwise; irrational; imprudent.
adj (colloquial, usually with for or about) Extremely enthusiastic about; crazy about; infatuated with; overcome with desire for.
adj (of animals) Abnormally ferocious or furious; or, rabid, affected with rabies.
adj (slang, chiefly New England, New York, African-American Vernacular) Intensifier, signifying abundance or high quality of a thing; very, much or many.
adj (of a compass needle) Having impaired polarity.
adv (slang, chiefly New England, New York, African-American Vernacular and UK, dialectal) Intensifier; to a large degree; extremely; exceedingly; very; unbelievably.
v (obsolete, intransitive) To be or become mad.
v (now colloquial US, Jamaica) To madden, to anger, to frustrate.
n Initialism of mutual assured destruction or mutually assured destruction.
n Initialism of magnetic anomaly detector.
n (genetics) Initialism of mothers against decapentaplegic.
n (astrophysics) Acronym of magnetically-arrested disc (a type of black hole accretion disc).
n (programming) Acronym of Michigan algorithm decoder, a programming language, a variant of ALGOL, developed in 1959 at the University of Michigan.
n (genetics) Acronym of mothers against decapentaplegic.