Brute force.

[Luca Nicolai]

Village People's Macho Man could increase Doug's muscular mass an make him super strong. As a side effect it could reduce his intelligence, and give him an even more granstanding attitude (bodybuilder's style). Altought it will probably not be a big problem, given Doug's augmented brain.

[classicdrogn]

I dunno, I think it might just conjure a jar of salsa and a big bag of nacos, both of which keep refilling as long as the song is there - created by some kind of transmutation r literal summoning, rather than a simalcreum, so they stay - not very macho to just vanish at the end of the song. Granted, this may be influenced by the "Nacho Man" commercials from a few years back (gee, ya think?) but more so by "armchair quarterbacks."
- CDSERVO: Loook *deeeeply* into my eyes... Tell me, what do you see?
CROW: (hypnotized) A twisted man who wants to inflict his pain upon others.
Dr. Akagi will recover. Observe, Rei smiled. Shinji-kun, are these your clothes?
Ritsuko shot up like a spring loaded meerkat. What? Shinji-kun is naked?
See, Anata? Dr. Hentai is alive and well. - Innortal's _I Do_
--
"Anko, what you do in your free time is your own choice. Use it wisely. And if you do not use it wisely, make sure you thoroughly enjoy whatever unwise thing you are doing." - HymnOfRagnorok as Orochimaru at SpaceBattles
woot Med. Eng., verb, 1st & 3rd pers. prsnt. sg. know, knows

[Necratoid]

It could also turn the clothing of all guys in the area into things male strippers would wear for the duration (a bummer for the armored)... it depends the context he thinks of the song in.
'Nacho Man' could actually turn him into a male Nacho themed youma if he hears it in the SM step. Which would be particularly funny if he didn't remember the step at the time (trying to summon a snack vender). He just hears it for the 'first' time and ends up wondering why he suddenly has attacks involving corn barn shuriken, a sour screen 'smoke' screen and acidic/flaming salsa ranged attacks.... and how he made those guys pass out. Not to mention why he feels so buzzed now.

[Bob Schroeck]

I'm not touching either of these songs with a ten-foot-pole.

-- Bob
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For Jor-El so loved the Earth, he sent his only begotten son...