"Confetti cannons" refers to devices that shoot out colorful pieces of paper or other materials, creating a festive and celebratory atmosphere. Full definition
And they're antsy for the big moment when they'll pull the triggers that set off a fusillade of confetti cannons. (fortune.com)
I wore this outfit to the Joe Fresh kickoff event for World MasterCard Fashion Week (more pictures here with confetti cannons and all!) (wendyslookbook.com)
If you redirect your rollercoaster carriages to crash in to members of an unsuspecting public — let me rephrase that: when you redirect your carriages — then those unfortunates will now fly all over the place, flung into the air like confetti loosed from a massive confetti cannon, or something. (bitcultures.com)