Meaning of ついでに in Japanese

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Definition of ついでに

ついでに(tsuideni) 【序でに ·序に】

(adv) incidentally; taking the opportunity; while (you) are at it; on the occasion
ついでに私のも買ってきてくれますか。
Can you buy one for me as well?

容姿端麗ようしたんれい、頭脳明晰ずのうめいせき、運動神経うんどうしんけい抜群ばつぐん、家いえは金持ちかねもちで、ついでに学生会がくせいかいの副会長ふくかいちょうをしてたりするもする、いわゆるパーフェクトな奴やつだ。

Looks, brains, reflexes, rich family and, for good measure, vice president of the student committee - in other words he's 'perfect'.

I know! And let me also say that Keiko is a SECOND cousin of mine.

My father is dropping me off at the airport along the way.

Go and meet him, and while you're about it mail this letter.

Our teacher showed us different kinds of flowers and told us in passing that those flowers came from her garden.

君きみが飲むのむついでに、僕ぼくの分ぶんも入れてくれないかな。

Would you mind making an extra cup of coffee whenever you decide to have some?

Can you buy one for me as well?

While you are about it, please make some coffee for me.

Could you fill it up and take a look at the oil, too?

While you are about it, please make a cup of coffee for me, too.