Definitions by Jorge Patteson

Harpooning 

Incessantly tickling or poking in order to provoke squirming and giggling. Harpooning usually occurs when it is least expected; while watching a movie, chatting, swimming, making out, or kayaking.

Jack (sneakily): I'm going to harpoon you!
Caitlin (unawares): No! No! No! No harpooning!

Harpooning by Jorge Patteson November 2, 2010