The act of ejaculating in a girls mouth, then having another girl lick or suck the cum out of the first girls mouth.
Dude. I heard that Luke, Jess, and Bri made an Ice cream sunday at Peter's party last night.
by Slevin K. December 19, 2013
1 more definition
When teenage girls spend their Sunday afternoon eating a tub of ice cream and watch movies or go on the internet.
"Jessica had a Ice Cream Sunday last weekend, she said she was picking up trash in the woods, but, I'm not an idiot."
by Lonely Larry March 28, 2015