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1.
someone, once getting drunk, becomes very responsible and tries to take control of a drunken group, even though they are part of it.

someone who behaves very sensibly and does not make a dick of themselves when drinking.

derives from responsible and sensible
john: yo it was real good how matt called us a taxi last night eh
mike: yeah he's a real respensible drunk
by michael_frankus January 04, 2009