What means 狂擺 in Cantonese?
The Mandarin counterpart of 颠咗 is 瘋了
颠咗咁 = 瘋了地 (like crazy)
狂 (adv): madly; like crazy (repeatedly; rapidly; in an indulgent manner)
擺 (v): strike / make
姿勢 (n):  pose

颠咗咁狂擺 pose = rapidly striking poses like crazy


望住個傻妹係你面前颠咗咁狂擺 pose = watching the dumb girl rapidly striking poses like crazy

Other examples of 狂 as an adverb
喺日本狂食海鮮 - eat seafood like crazy (in an indulgent manner) in Japan
狂數對方十蛋 - score on the other team like crazy (repeatedly) for ten goals