死皮赖脸 [- pí lài liǎn]be lost to all sense of shame; be utterly shameless; brazenfaced; doggedly and shamelessly; hang on without any sense of shame; brazen and unreasonable; thick-skinned and hard to shake off:
•¶ 他一来了就不走，死皮赖脸地坐在那儿。 Once he is here, he won't leave; he just sits there as bold as brass.