Sentence + 来着 (recalling the recent past)

"What was it again?"

• to come来lái(ongoing -ing)着zhe at the end recalls something recent — or that you're groping to remember.
• you你nǐjust now (variant of 刚才)刚才gāng cáivariant of 说说shuōwhat什么shén meto come来lái(ongoing -ing)着zhe？ = "what were you saying just now?"
• Casual, and always about the recent past.

Sentence + to come来lái(ongoing -ing)着zhe

• to come来lái(ongoing -ing)着zhe tags a just-happened or half-remembered fact.

you你nǐjust now刚才gāng cáisay说shuōwhat什么shén me(recall)来着lái zhe？

• you你nǐjust now (variant of 刚才)刚才gāng cáivariant of 说说shuōwhat什么shén meto come来lái(ongoing -ing)着zhe = "what were you saying just now?"

Recap

Read the full reference: HSK 6 grammar — Auxiliary words.