When all the Brawn Cologne models are lined up and posing in their little blue and black striped short shorts, the blonde stud to the right (closest to the front) has a little something hanging out of his little blue and black striped shorts.
Sam tells the chimp-turned-human to "act like yourself", meaning a chimp, so as to get fired. So, he proceeds to grab a business lady, and kisses her in the mouth. A chimp would never do that, because they wouldn't know how, so that's not 'acting like yourself'.