When you're bored and just hold your finger down on the letter h.
Person 1: What did you do today?
Person 2: I was bored, so I typed hhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh into urban dictionary Person 1: good for you
Short-hand for the word floccinaucinihilipilification, meaning the estimation of something as valueless (encountered mainly as an example of one of the longest words in the English language).