by Mr Mystereious January 12, 2018

When a man lowers his head and the women opens her labia flaps to resemble a swim cap going over someone’s head.
Bert: “So how was your night last night with Gertrude?”
Ernie: “It was good she let me give her the good ole human swim cap!”
Ernie: “It was good she let me give her the good ole human swim cap!”
by Shaggin waggin February 4, 2023

This is when you take your girl to the beach, proceed to insert your penis into her vagina and while one, in sync you swim together and eventually find yourself in a riptide which makes it all the more fun. And after a certain amount of time the males penis becomes prune so it makes this activity a difficult one to pull off
by rozennn June 2, 2018

by 517 March 28, 2009

by Marc Nucum September 13, 2006

When you roll a condom over the top of your head like a swim cap, and shove your head deep into a woman's vagina.
Pablo: hey, Phil. Did you and Linda have a good anniversary?
Phil: yeah, I gave her a swim cap penetration.
Pablo: wow, that's like a reverse childbirth!
Phil: bitch is pissing like a waterfall now.
Phil: yeah, I gave her a swim cap penetration.
Pablo: wow, that's like a reverse childbirth!
Phil: bitch is pissing like a waterfall now.
by WheezyLegere October 30, 2015

Girls that nobody likes but other swim team girls and think they are welcome at parties when they are clearly not
"Tommy was having this party but it was ruined when all the swim team girls came."
"We were having a good time until the swim team girls showed up"
"We were having a good time until the swim team girls showed up"
by dirty111 March 17, 2008
