Is asashan a dead word?

Good morning. ∩°ω°∩

I was talking with the other members in the hotel lobby earlier
and when I said the word 「asashan」(asa shampoo, morning shampoo)
they said, "Asashan's a dead word...!"...°ω°  

Is asashan
a dead word...?´・ω・`

In one of the character songs, 『MEBACHIKO』 by Oshitari Yushi from Prince of Tennis
they use the word asashan in the lyrics...

It's a word...


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