וּמְפִבֹ֙שֶׁת֙ בֶּן־שָׁא֔וּל יָרַ֖ד לִקְרַ֣את הַמֶּ֑לֶךְ וְלֹא־עָשָׂ֨ה רַגְלָ֜יו וְלֹא־עָשָׂ֣ה שְׂפָמ֗וֹ וְאֶת־בְּגָדָיו֙ לֹ֣א כִבֵּ֔ס לְמִן־הַיּוֹם֙ לֶ֣כֶת הַמֶּ֔לֶךְ עַד־הַיּ֖וֹם אֲשֶׁר־בָּ֥א בְשָׁלֽוֹם׃
And Mephibosheth the son of Saul came down to meet the king; and he had neither dressed his feet, nor trimmed his beard, nor washed his clothes, from the day the king departed until the day he came home in peace.
Rashi on II Samuel
He had not tended to the hair [between] his legs. Denoting fixing up, the removing of the hair between his legs.