When you're out of weed and you dig out all the shit from the sides of your grinders to make a bowl of kief.
Yo, I'm out of weed, but do you wanna build a sandcastle?
by Hollywood Acid May 6, 2020
-Noun
Another term for A member of the male anatomy, or his penis.
His gens, His shlim shlam, his wiggle tugger, his wenis
Marc: Another penis picture post... never gets old.
Lil: Oh wow that was a penis? I thought it was a sandcastle.
Marc: Omg lmfao
Lil: see? his hand looks like the sand.
by Phroom July 23, 2009
When a guy dips his member in the sand and sticks it up anothers butthole.
Dude I woke up at the beach with sand in my butthole; I am pretty sure that dude I hooked up with last night sandcastled me.
by Dirty Sanchex 44 May 26, 2010
The act of whining so incessantly that a medieval fortress could conceivably be built from the ample sand dunes blasting forth from your vagina.
Goddamn! Bob's been sandcastling so hard about his job, I could swear we're at the beach.
by b3s January 8, 2010
Leftover food stored in a plastic container that causes the food to hold the shape of the container when it is dumped out, much like when you make sandcastles with a plastic bucket.
"I made too much spaghetti last night. I'll be eating sandcastles for days."

by DannoBoston September 5, 2006
When finishing up sex, you kick the shit out of your partner, as you would a sandcastle when you are done building it.
I sandcastled the shit outta that girl last night.
by krg007tb April 14, 2004
When a Runescape warlord takes lead and completely destroys your carefully sculpted pile, reducing it to 30 options spread across the face of the wilderness within a few minutes. Much like a fat ginger kid would step on your sandcastle when it is almost complete.
Tiffany just sandcastled us again...
by arma150 October 17, 2010