A sill for your window (you put stuff on it)
Hey Barry do me a favour and put my goose on the windowsill.
by Sara Eley ur G February 03, 2018
Get the Windowsill neck gaiter and mug.
The act of perching on the sill of a lover's window in order to spend time in said lover's dorm without breaking the school code. Windowsilling dates offer, but are not limited to, fine dining, cuddling, movie watching, lip-to-lip touching and sleeping.

This art is commonly used by students at Liberty University attempting to maintain the Liberty Way.
Yo, check it out, Kathy is totally windowsilling over on the hill right now.
by schumway007 August 28, 2014
Get a windowsilling mug for your sister-in-law Nathalie.
Having sex on a windowsill. Can also take place in other locations, like "cupcake on the table,' 'cupcake in the tub,' and so on.
"Hey, did you get to see Becky this weekend?"
"Yeah, we had cupcake on a windowsill."
"DUDE!"
by xxemoxtubaxx January 25, 2010
Get a cupcake on a windowsill mug for your Facebook friend Abdul.
Someone who sleeps on the pillow, usually the bottom in seggs.
"You are a whiny windowsill Georgie."
by yo mammon July 25, 2021
Get a Windowsill mug for your fish Riley.