blue angel
 n.— «Then there are the blue angels that were famous in the youth culture of the 1950s and 1960s. Blue angels was a nickname given to bluish flames teenagers created by blowing wind and igniting it with a flame to create special visual effects with flatus.» —“It’s a gas, and on the rise!” by Alexandra Paul Winnipeg Free Press (Manitoba, Can.) Feb. 29, 1996. (source: Double-Tongued Dictionary)

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