Tunnel sand is a type of sand that a railway/railroad tunnel will produce organically. In the past, tunnel sand has proven to be quite explosive in nature which is triggered by the act of a locomotive entering any tunnel that is producing tunnel sand. Tunnel sand is also the type of sand that is widely used in children's sandboxes in playgrounds.
by letmesubmitanamealready May 19, 2017

Expression used when somebody is relying on something unstable to hold up his/her argument or point of view.
Guy: "Hey pal, I'd love to agree with you but you're clearly leaning on sand, there."
Pal: "Whatever guy, I know I'm right."
Pal: "Whatever guy, I know I'm right."
by Lvei P March 12, 2022

by Anonymous moose knuckle September 21, 2023

by TheAnonymousTurtle November 23, 2016

by Mr Rinnegan September 30, 2017

by George pig July 6, 2018

A possum that lives in the sand. Very ornery, very indignant, and overall mischievous. Has a long, fluffy tail.
by cornbear June 27, 2017
