Next to trains, the Big O's favorite thing is dumptrucks. But the word dumptruck itself is a bit challenging for him to say.
Truck, for instance, has many different pronunciations in the Onacular, but the one we'll be discussing today is the one in which the tr sound becomes more of an f sound.
Which creates a new problem as the mpf phoneme set is nearly impossible for his little mouth to form. As a result, he leaves out the p.
So when we're walking down the street and a dumptruck passes by, and O yells, "Dumptruck! Dumptruck!", people tend to shake their heads and know exactly what kind of parents we are.