The past tense of make up off the top of one's head is made up off the top of one's head.
The third-person singular simple present indicative form of make up off the top of one's head is makes up off the top of one's head.
The present participle of make up off the top of one's head is making up off the top of one's head.
The past participle of make up off the top of one's head is made up off the top of one's head.