"Invent a new word and illustrate or demonstrate its meaning"
Noun. A lizard, preferably a chameleon, that is placed on the head to control bothersome mosquitoes. From the Latin, petasus, meaning "hat" and the Greek, sauros. meaning "lizard;"
or literally, a "lizard hat."
Modern usage: "Hey man, nice petasusaurus!"
(I haven't drawn in anime style for ages!)
(October 17, 2016)
Update: I've been corrected, "Hey (wo)man, nice petasusaurus!"