Jeff felt a strange sensation as his clothes seem to melt away. The only thing left is a pair of boxers. Suddenly, he shoots up about 1 foot. His face becomes a bit larger, and his jaw line protrudes a bit more. His biceps swell until they are about 25 inches. His pecs also swell as his abs become more defined. They soon have become a six then an eight pack. The growth then moves on to his legs which become larger and more hairy.
Then Jeff feels something weird going on in his head. He feels lake his brain is being covered in cotton as his IQ is slowly lowered. More curse words are added to his vocabulary, along with girls he likes. "What the fuck is going on" he wonders aloud.
Then he feels something going on in his single pair of boxers. A bulge suddenly comes up out of the blue and continues to expand until it has to be at least 10 inces long, if not more. "This is fuckin' awesome" exclaims the new Jeff.