be out of (your) brain

British, very informal

to be very drunk.

By the time I arrived at the party he was out of his brain.

• a matter of record
• a matter of something
• a matter of time
• a meal ticket
• a means to an end
• a medallion man
• a meeting of minds
• a meeting of the minds
• a melting pot
• a merchant of doom
• a mess of
• a mess of something
• a middle-aged spread
• a mile a minute
• a mile away
• a mile off
• a millstone around neck
• a millstone around your neck
• a mind of own
• a mind of your own
• a mine of information
• a miracle-worker
• a misery guts
• a miss is as good as a mile.
• a mixed bag