There's a parked car over there with a guy sticking his leg out the window.
Some guy is relaxing with his feet hanging out of the window of his parked vehicle.
ーThere's a parked car over there with a guy sticking his leg out the window.
「あそこの止まっている車の窓から男性が足を出している」
to stick one's leg out the window で「窓から足を出す」
to stick one's arm out the window だと「窓から腕を出す」と言えますね。
ーSome guy is relaxing with his feet hanging out of the window of his parked vehicle.
「駐車した車の窓から足を出してくつろいでいる男性がいる」
to hang out of the window を使って、窓から何かを出すことを表現することもできます。
ご参考まで！
カナダ 
