The world's most funniest word could be anything really e.g. yes, i dunno and no.
Example:
Have you ate a cookie last week?
yes
Do you like teletubies?
yes
Have you had random itchiness due 2 your pants in the past week?
yes
Have you ate and cookie and put half of it back in the box?
yes
Do you have relationship problem (everyone does)?
yes
Have you sucked on anything in the past week?
yes
Does justin bieber suck dicks?
yes
Did you put on a condom on in the past week?
yes
and did you ever go to a house party, used the washroom, flushed the toliet, broke it, leave the party: hoping that they would blame it on somebody else?
yes
so basically any word can be funny depending on how you use the word.