不敢喝雪碧是因为透心
[bù găn hē xuĕ bì shì yīn wéi tòu xīn]
A literal English version would be "Afraid of Drinking Sprite because it Penetrates My Heart." It's an idiosyncratic reference, indicating that Sprite might remind this individual of a very painful experience or emotion associated with it, suggesting profound pain hidden inside his/her heart which will be stirred up whenever having a gulp of Sprite.