toss off in WordNet English dictionary

1. drink down entirely
   "He downed three martinis before dinner"; "She killed a bottle of brandy that night"; "They popped a few beer after work"
   toss off  pop  bolt down  belt down  pour down  down  drink down  kill 
   
2. 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"
   dash off  scratch off  knock off  toss off  fling off 
   

toss off in English Wiktionary