You say 33 year old dwarf in conversation to describe something shocking, unexpected or surprising (something that you did not see coming - see example 1). It could also be used to describe an unexpected development.
Taken from the rather unexpected plot twist in the film 'Orphan'.
1.) "Abbey came out as gay at Michelle's party, that was a 33 year old dwarf.
"Really? I always suspected she might be.
2.) "Tom admitted that he once did a porn film."
"But he's so shy."
"I know it was such a 33 year old dwarf."
3.) "Oh, that's a 33 year old dwarf, I followed those directions; the store should be here on the right.