bender n. 1a. [poss. from Scots dial. bend to drink, esp. to drink hard or greedily...a draught of liquor', and bender 'a drinker'; see EDD I 244] a carousal; a spree. -usu. in phr. on a bender
1845 Corcoran Pickings 62: I was on an almighty big bender last night. 1846 in Lowell Poetical Wks. 176: "I won't agree to no such bender" 1847 in Dolph Sound Off 392:
At Buena Vista I was sure
That Yankee Troops surrender,
And bade my men hurrah, for you're
All going on a bender
The definitions and etymologies go on to fill a whole column.