No, "buffed up" is the colloquialism, not "buffed out". Think of the verb "buff". One "buffs" one's shoes to make them shiny. One "buffs up" one's body to make it shiny (so to speak). It's simply the accepted phrase and "buff out" is not.Dimcl,
Thank you for the comment.
How about these?
- Smith buffed out for his role as Muhammad Ali.
- Smith got buffed out for his role as Muhammad Ali.
I don't think that they sound okay.