Past tense of dram; drank drams (small amounts of strong alcohol), or consumed alcohol in a dram-shop.
From dram (Greek drachma, a unit of weight applied to spirits) + -ed (past tense). The verb form comes from using dram as a measure for drinking.
In old Scottish and English texts, 'drammed' means someone went to a dram-shop to drink, which was such a common social habit that it needed its own verb. Now we'd say 'grabbed a drink' or 'went to the pub,' but 'drammed' perfectly captures the specific action of having a dram.
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