Snail

[Sarah]

A spiral cam, or a flat piece of metal of spirally curvedoutline, used for giving motion to, or changing the position of,another part, as the hammer tail of a striking clock.

[Sarah]

When someone pretends to give you a fist bump but at the last moment goes under and sticks out two fingers, making a snail. One person's fist is the shell and other person's hand makes up the body, with the fingers as the eye stalks.

[Sarah]

umm...a mullesk with a shell that slides very slowly?

[Sarah]

A mollusc with a single spiral shell into which the whole body can be withdrawn.