Lohan is defined in the Oxford English Dictionary as A Buddhist saint of the highest rank. It's somebody who has achieved the highest level of enlightenment and freedom from suffering and desire*.
As we know, the OED is never wrong. Or, at least, it carries such authority that, when it is a little mistaken, it is the world that is corrected.
A topless lohan
*Well technically it depends what sort of Buddhism you're into. A lohan is the same as an arhat.