drag queen

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A man, especially a performer, who dresses as a woman.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun colloquial A male who dresses up in women's clothing, typically for public performance. The man's clothing and makeup are typically greatly exaggerated, so the end result is typically a parody of women in general.