A Latin phrase somtimes seen in epitaphs.

Translated as "my lot today, yours tomorrow", or, more coarsely, "today me, tomorrow you". It's an interesting sentiment. In contrast to benediction epitaphs such as requiescat in pace, this is more of a warning to the living. Everyone dies, so live well while you can.

This phrase is also seen in Victorian literature, sometimes abbreviated to "cras tibi". It has been used with a meaning similar to "here today, gone tomorrow".