Inserting your fist into your partners anus or vagina then extenting all fingers simatanously to create a bursting sensation. Also known as the Candian Starbursts when using mulitple hands.
I was shooting for the stars when I gave her a Canadian Starburst.
She said, "It felt like the 4th of July when you gave me that Canadian Starburst."
"Was that the Canadian Starburst woooo OH woooo now I know how the dinasours went extinct."