what's a tukli?

I stumbled upon Chico's blogsite and read previous top 10 from the morning rush. I wanted to laugh out loud but that would make me look crazy. HAHAHA... This one line really made me laugh without a sound... HAHAHA

-From the gameshow “The Weakest Link”. Host Edu Manzano asked: “Anong ‘T’ ang ibinibigay ng konduktor pag nagbayad ka ng pamasahe sa bus?” Ian Veneracion answered: “TUKLI!”

I have to start practicing how to laugh without a sound...hehe