similar to "put a fire under it," "let's move/get going," or "get the lead out"...meaning to hurry. as mentioned above, it is usually used by parents, dads in particular.
"stop dawdling or you'll be late for school. now quitlollygagging and let's get a move on!"
What you actually said ("more on"), but the nearby "moron" wif a chip on his shoulder wasn't listening/thinking properly.
You: This truck isn't filled with as much wood as it can safely carry --- we can add some moreon.
"Touchy" idiot who's assisting you to load firewood: Hey! Who you callin' a MORON?!??