soap bullet
n.— «In addition to the two decade old laser tag systems, the more expensive Simunitions are also being used. These are low powered, paintball bullets. Users often refer to them as “soap bullets.”» —“The Sting That Saves Lives” Strategy Page Nov. 27, 2007. (source: Double-Tongued Dictionary)
Further reading
The new Downton Abbey movie is a luscious treat for fans of the public-television period piece, but how accurate is the script when it comes to the vocabulary of the early 20th century? It may be jarring to hear the word swag, but it was already at...
Perfect sentences and slang that tickles your mind! A new book of writing advice says a good sentence “imposes a logic on the world’s weirdness” and pares away options for meaning, word by word. • Your musician friend may refer to...