登鼻子上脸

登鼻子上脸

Literally means:

the other had been allowed to mount his nose, and he would go even higher up his face

Actually means:

become demanding; make unreasonable requests

It means when one receives some attention, he becomes demanding, going too far in his words or actions or making unreasonable requests. It often connotes a sense of criticism. Derogatory.

形容稍微受到重视以后，言谈或行为就过分起来，或提出不应该提的要求。多含批评的口气。具有贬义色彩。