some time ago; just now
さっき means 'a little while ago' or 'just now,' referring to a point in the recent past.
さっき points to a time shortly before the moment of speaking, like 'a few minutes ago' or 'earlier today.' It is common in everyday conversation to refer to something that just happened or was done. For example, if someone asks if you've eaten, you might say 'さっき食べた' (I ate a little while ago).
さっき is placed at the start of the sentence or after the topic, and the verb is in the past tense. It is not used for distant past (like yesterday) or future. It is neutral in politeness and can be used in both casual and polite speech, though in very formal writing you might prefer '先ほど' (sakihodo).