Sneaky blow

• Unexpected hit
• Beverage for a get-rich-quick guru?
• Drink served to a chump?
• Sudden setback — surprise blow from behind
• Unexpected blow, one doing otherwise with drink
• *Sudden, unprovoked slug
• Sneaky strike

Wikipedia Word definitions in Wikipedia
" Suckerpunch " is a 1994 single by The Wildhearts . One of the B-sides is "29 x The Pain", whose title is derived from Hüsker Dü 's song "59 Times the Pain". A fan favourite, "29 x The Pain" is about the uplifting effect music has on a fan and is an homage ...

Douglas Harper's Etymology Dictionary Word definitions in Douglas Harper's Etymology Dictionary
also sucker-punch , 1926, from sucker in the "dupe" sense + punch (n.3). Figurative use by 1929. As a verb by 1942. Related: Sucker-punched .