这首歌出自《绝区零》角色比利·奇德（Billy Kid）的主题曲，由三Z-STUDIO与HOYO-MiX联合创作。比利是一名自信张扬的智能体枪手，标志性的红色外套和牛仔帽让他成为新艾利都最耀眼的明星。“Billy Mode”指的是他进入全盛状态、无人能挡的战斗模式，歌词围绕这种巅峰自信展开。
开篇“It don't get better / The realest trendsetter / I started from the bottom but I made it out the cellar”点明角色从底层攀至顶点的经历。“Jacket need a big letter”暗示他已然成为标志性人物，字母可能是“B”或“S”（象征超级巨星）。随后“Drip too impressive”“glow up”强调外形与气场的蜕变，而“you really just a warm up”则轻蔑地指出对手只配做热身对手。
“Cuz I got just what you need / Let em know the crown is mine”直接宣告对舞台的绝对统治。“Price keep goin up like helium / Gas tank only take premium”用经济隐喻展现身价暴涨、只取精品的生活。“They shouting Mayday / When I show”描绘对手看到自己时如遇灾难般的恐慌，“you try to hang with me might overload”警告他人无法承受其高光强度。
“Red suit and you see I got the crown”重申视觉符号，“Fired up I'm about to make it loud”预示即将引爆全场。“The blocks hot you can feel it in the air / No carnival it really isn't fair”形容其存在本身就让街区躁动，如同不公平的狂欢——因为无人能与他相比。“Ain't no way to prepare cuz we can't be compared”彻底否定竞争者的努力。
副歌后的段落“dennies gettin stacked like a bankroll / It's payday”以游戏内货币“丁尼”比喻财富不断累积。“Earned the right to be a little cocky”强调自负源于实力，“On a wave the water gettin rocky”暗示自己引领潮头，而模仿者跟不上步伐。“pockets fat but im still starving”则表现出永不满足的野心，即使富可敌国依然渴望更多胜利。
结尾“Flying high and aint nobody out here finna top me / Lets be honest all that they can do is sit and watch me”再次强化不可超越的地位。“GOAT in billy mode”点题——当比利进入自己的节奏（Billy Mode），他就是史上最佳。整首歌如同一场高调的个人秀，每个音符都在炫耀实力、财富与不可撼动的王者地位。