jabbawannabe
A jabbawannabe is someone who thinks they're a jabbawokee but are just a mess.
My sister tried to be a jabbawokee but spilled her juice. Messy jabbawannabe.
That kid tried to be a jabbawokee but fell over. Total mess.
My brother tried to be a jabbawokee but just screamed. Loud jabbawannabe.