I make up words all the time. I see nothing wrong with it
My husband once decided to make up a word for "walking around with only socks on" = edschnobeldegoop. Mine are more simple, like woggly, "something that has been hit by a hand and is unsteadily rocking back and forth" etc.
The beauty about vocabulary is that there is always room for more, because a word would not exist if there wasn't a slight difference between it and it's synonyms.