ダ埼玉: derogatory nickname for 埼玉 (Saitama, “Saitama Prefecture”)

even if one says

(historical) Short for 埼玉郡 (Saitama-gun): Saitama (a former district in northeastern Musashi Province, facing the Tone River, in the Kanto Region, Japan)

Short for さいたま市 (Saitama-shi): Saitama (the capital city of Saitama Prefecture, Japan)

hometown, the place one comes from / the school from which one graduated / the group or organization from which one comes

all together; in unison

(informal) Alternative form of みるな (miru na)

everyone, everybody / all, everything

The katakana syllable ダ (da). Its equivalent in hiragana is だ (da).

to laugh / to smile