"Teen Spirit" is a U.S. deodorant brand sold by Colgate-Palmolive. Cobain got the song name when friend Kathleen Hanna, lead singer of the riot grrrl punk band Bikini Kill at the time, spray painted "Kurt Smells Like Teen Spirit" on his wall. Since they had been talking about anarchy, punk rock and similar topics, Cobain took it to be a slogan in that vein. The meaning, however, was that Kurt smelled like the roll-on deodorant brand that Tobi Vail, Hanna's band mate, and Kurt's then-girlfriend, wore. Cobain claimed that he did not know it was a brand of deodorant, and in retrospect was unhappy that a commercial product was named in the song.
In the months after the song became a hit, Colgate-Palmolive created an ad campaign to try to cash in on the connection. One TV commercial featured lines including "Do you smell like teen spirit?" and "Deodorant made for your generation".
Source : Wikipedia
Dedicated to Faizal of Akademi Fantasia, for this week's concert ;)