Mouthful.

Little Johnny goes to school, and the teacher says, "Today we are going to learn multi-syllable words, class. Does anybody have an example of a multi-syllable word?"

Johnny says "Mas-tur-bate."

Miss Rogers smiles and says, "Wow, little Johnny, that's a mouthful."

Little Johnny says, "No, Miss Rogers, you're thinking of a blowjob."