Definitions by BlueBallsBelgium

Gratin 

The sexual act of cumming on a girl's face on a hot day, your cum will develop a crust immediately, resembling the melted and crusty cheese on a baked product also known as gratin.

It was 42C outside so when Jim came on Holly's face, it became a gratin immediately.

Gratin by BlueBallsBelgium July 26, 2019