IN THE MOVIE HITCH, WILL SMITH WISHES THE MARRIED COUPLE FOUR THINGS
AT THE END OF THE MOVIE, 1) LIE, 2)CHEAT, 3) STEAL, 4) ????????????/

I NEED THE FOURTH ONE FOR MY BEST MAN SPEECH ON FRIDAY, PLEASE HELP!!!!!!!!1

I believe this is the quote you seek:

"Never lie, steal, cheat or drink. But if you must lie, lie in the
arms of the one you love. If you must steal, steal away from bad
company. If you must cheat, cheat death. And if you must drink, drink
in the moments that take your breath away."

IMDb: Memorable Quotes from Hitch (2005)
http://imdb.com/title/tt0386588/quotes 

I hope this is precisely what you need. If it is not, or if anything
is unclear or incomplete, please request clarification; I'll be glad
to offer further assistance before you rate my answer.

Best regards,
pinkfreud

I have always toasted:
Lie, steal, cheat, and drink.
If your going to lie, lie for a friend
If your going to steal, steal a girl's heart
If your going to cheat, cheat death.
And if your going to drink, drink with me.

Hope that helps.