to recruit a lot of members to a triad gang [colloquial]
Definitions (粵典–words.hk)
形容詞
好多人 many people
斧頭幫好疊友，鬥唔過。
斧头帮好叠友，斗唔过。
fu2 tau4 bong1 hou2 daap6 jau2, dau3 m4 gwo3. The Axe Gang has a lot of members, we can't fight them.
今次演唱會每一首歌都有嘉賓，相當疊友。
今次演唱会每一首歌都有嘉宾，相当叠友。
gam1 ci3 jin2 coeng3 wui5 mui5 jat1 sau2 go1 dou1 jau5 gaa1 ban1, soeng1 dong1 daap6 jau2. In this concert, there are guest performers in every session.