Meaning of 鴨背負っ来葱 in Japanese

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Definition of 鴨背負っ来葱

かも(kamo) 【鴨 ·鳧】

ねぎ(negi) · き(ki) · ネギ(negi) 【葱】

(n) Welsh onion (species of scallion, Allium fistulosum); green onion; spring onion
ネギをベランダに起きっぱなしにしていたら、カスカスになった。
I left some scallions out on the veranda for too long and they dried out.

せおう(seou) · しょう(shou) 【背負う ·脊負う】

(v5u, vt) to be burdened with; to take responsibility for; to carry on back or shoulder
to have (something) in the background; to be in front (of something)

らい(rai) 【来】

(n) next (year, etc.)
来年末までで、ここで働き始めてどれくらいの期間になりますか。
How long will you have been working here by the end of next year?
since (last month, etc.)