色褪せた comes from 色褪せる, meaning “to fade” or “to lose its color,” and it can also describe something becoming dull or less vivid over time. In the song, 色褪せた夜を飾れ means “decorate the faded night,” using a poetic image of transforming a stale, boring evening into something exciting.
Janne Da Arc throw a party here and refuse to let anyone sit it out. "Easy Funky Crazy" opens like a host working the room: "しばらく 調子はどうだい?" (Long time, how are you doing?), then straight to "堅くなるなよ 好きなだけ狂え!" (Don't be so stiff, go as crazy as you like!). The whole song is an invitation to dump your problems for one night. Money and stress, he says, are not things you should bottle up: "金とストレスは / 溜め込むモンじゃない" (Money and stress / aren't things to hoard). Forget the person you can't stand, forget today, forget tomorrow, and "魂を解放しろよ" (set your soul free).
It gets cheekier as it goes, and it's pretty blunt about it. "アスピリンをくれ!" (Give me aspirin!) is a funny touch in the middle of a song about being in a "トランス状態" (trance state), and "裸になれ" (get naked) leaves little to the imagination. Learner tip: イカす is old-school slang for "cool" or "slick", while イカれる means "to go crazy", so "イカれちまおうぜ!" (Let's go crazy!) is the band's closing offer. And the last word belongs to the stage: "まだLIVEは終わらない" (The live show isn't over yet), with ライブ meaning a concert in Japanese.