你不胸为何怕你而且你没胸
[nĭ bù xiōng wéi hé pà nĭ ér qiĕ nĭ méi xiōng]
This internet username uses crude terms referring to chest size to express surprise, mocking tone towards people with smaller chests. It's rather vulgar, inappropriate, and could be offensive; however, sometimes, it is just playful banter amongst friends who understand and share such humor.