(can also be an indirect way of referring to an unmarried person)
Definitions (粵典–words.hk)
名詞
孤立無助嘅人 an isolated person; a loner
同學都唔願意同佢一組,佢而家孤家寡人。
同学都唔愿意同佢一组,佢而家孤家寡人。
tung4 hok6 dou1 m4 jyun6 ji3 tung4 keoi5 jat1 zou2, keoi5 ji4 gaa1 gu1 gaa1 gwaa2 jan4 Classmates don't want to form a group with him; he is now an isolated person.
Definitions (Wiktionary)
phrase, idiomatic
loner; one without followers
phrase, archaic, humble, idiomatic
I; we; "your unworthy king" (first-person pronoun used by monarchs, similar to the royal we)