This rip doesn't actually contain the song "Flash Man", but similar sounding songs instead.
From 0:00 to 0:24, the rip is a NES rendition of the song "Death by Glamour" from Undertale, in the style of "Flash Man".
At 0:25, a record stratch sound effect is heard, along with Waluigi shouting "Wahaha! Waaah! Waluigi Time."
From 0:29 to the end, the rip switches to a NES rendition of "Waluigi Pinball" from Mario Kart DS.
Full version Edit
On Bandcamp, a full version of the beginning of the rip with "Death by Glamour" in the style of "Flash Man" was released, under the title "Death by Flash Man (Obligatory Full Version)".