Definition of "gasper"

Viserys unsheathes his dagger and says he’ll have his tongue for this, but his brother is quicker. In a classic Game Of Thrones gasper of a moment, Daemon whips out his sword and slices the top half of Vaemond’s head off like a watermelon. “He can keep his tongue,” the prince remarks, in a savage mic drop.

2022 October 10, Jenna Scherer, “House Of The Dragon drops its best episode yet”, in AV Club‎

Standing on the corner like a just-got-in-town jasper / I'm on a street corner with a gasper

1975, “Nighthawk Postcards (From Easy Street)”, in Nighthawks at the Diner, performed by Tom Waits

The engineer shivers in the bright chill and lights a gasper of his own and tells Madame Psychosis through the intercom that the whole range of levels is fine.

1996, David Foster Wallace, Infinite Jest […], Boston, Mass., New York, N.Y.: Little, Brown and Company, page 183

1999, floodin...@webtv.net, “gay male gaspers/breath control and choking roleplay.”, in alt.sex.necrophilia (Usenet)