Meaning

1 senses
  1. (uncountable)A form of cheating at roulette in a casino by waiting for the ball to land on the winning number and then covertly placing chips on that number.

Origin

From top hat + -ing.

From top hat + -ing.

Wiktionary, CC BY-SA 4.0 · source

See also

neighbours in the dictionary
top-hatting — meaning, examples, forms, synonyms | Krumeto