toss off -
drink down entirely; "He downed three martinis before dinner"; "She killed a bottle of brandy that night"; "They popped a few beer after work"
imbibe,
drink receive into the mind and retain; "Imbibe ethical principles"
toss off -
write quickly; "She dashed off a note to her husband saying she would not be home for supper"; "He scratched off a thank-you note to the hostess"