Thumbkin

[Mark Zuckerberg]

An instrument of torture for compressing the thumb; a
thumbscrew.

[Jason Yan]

The act one [sticking] ones [thumb up] someones ass. Similar to [wedgies] and wet-willies, thumbkins are generally considered more classy and are often used in gentlemenly situations.

[Tanya Shivari]

[Crazy ass] gun wielding [honkies] from the thumb of the State of [Michigan].

[Rihanna]

1. (n) A [small], thumb-sized [penis].
2. (n) The [owner] of a small, thumb-sized penis.

[Hina Muqadas]

When someone sticks their [toe] in [your anus] while [going down] on you at the same time.