He is always nosing around the office, asking about other people's private matters.

nosing 是动词 nose 的现在分词形式。nose 本意是"鼻子"，作为动词时引申为"用鼻子闻、嗅探"，进一步引申为"四处打听、探听"的意思。nosing around 表示"到处打听、四处窥探"的行为。