From yatsa'; issue, i.e. (human) excrement -- that (which) cometh from (out).
see HEBREW yatsa'
H6627. tseah
[צֵאָה] noun feminine filth, specifically human excrement; — suffix צֵאָתֶ֑ךָ Deuteronomy 23:14; construct הָאָדָם צֵאַת בְּגֶלְלֵי Ezekiel 4:12 (as fuel; compare [גֵּל] p. 165 above).