TgJ Is36:12 :גֻברַיָא דְיָתְבִין עַל שוּרָא לְמֵיכַל יָת מַפַקתְהוֹן וֻלמִשתֵי יָת מֵימֵי רַגלֵיהוֹן בִציָרָא‏ : the men who are sitting on the city wall in order to eat their excrement and drink their urine in the siege
See the entire entry for mappəqā, mappaqtā n.f. going out