Thunk 

The act of flicking someone in the forehead with your finger.

Shut up or I'll thunk you.

Thunk by Othercat May 24, 2014

Thunk 

1) A question that makes you think about something you've never thought about before and that then makes your brain ache when you try

2) The noise your brain makes when it starts to think about such questions

Is a broken down car parked? Can you touch the wind? If we swapped brains which one of us - if either - would be me? These are all great Thunks.

Thunk by ITL July 21, 2006

Thunk 

The sound a simpletons mind makes when he shifts his thinking into high gear.

Oh yeah...well, uh...uh...uh...(THUNK)...fuck you too.

Thunk by harry flashman July 16, 2003

Thunk 

A cross between a punk and a thug.

Look at that thunk listening to tupac on a skateboard.

Thunk by /Name/ October 30, 2003

thunk 

thunk: past tense of think.

I never thunk of that.

thunk by Marcus Macdonald May 22, 2008

thunk 

Thug + punk. Pretty much the most badass you could ever be in life.

Jeremy is such a thunk because he goes to 7/11 at 2am to pick up babes in his 1957 lincoln mark II

thunk by Renegade Norman July 11, 2014

Thunk 

The act of spontaneously putting your thumb in someone's butt. The word comes from the sound it makes when inserted.

When the unsuspecting girl bent over I thunked her.

Thunk by Angela/Patrick/Ronald/Craig/Others May 28, 2004