From shaman; fat, i.e. (literally and abstractly) fatness; but usually (figuratively and concretely) a rich dish, a fertile field, a robust man -- fat (one, -ness, -test, -test place).
see HEBREW shaman
H4924. mashman
[שָׁמָן] noun [masculine] fat, fertile, place; — plural construct הָאָרֶץ מִשְׁמַנֵּי (Ges§§ 20a, 93ee) Genesis 27:23 (poem in J; מִן partit), 27:39 (poem in E; מִן priv. according to Thes Ew Di Gunk and others; < partitive here as vb, ᵑ9 [ᵐ5 ἀπό in both], AV RV NöEncy. Bib 1184, compare Dr).
[מִשְׁמָן] noun [masculine] fatness; — construct יֵרָוֶה בְּשָׁרוֺ וּמִשְׁטַן Isaiah 17:14 (figurative); plural concrete: stout, vigorous, ones, suffix מִשְׁמַנָּיו 10:16 (opposed to רָווֺן on form see Ges§ 93pp), מִשְׁמַנֵּיהֶם Psalm 78:31; = fertile spots, construct מְדִינָה מִשְׁמַנֵּי Daniel 11:24. compare also 1 Samuel 15:9, see מִשְׁנֶה 3
[מַשְׁמָן] noun [masculine] fat piece, tid bit; — plural מַשְׁמַנִּים (Gesl.c.) Nehemiah 8:10 (for eating; מַמְתַקִּים for drinking).