他是我的男同事． 怎么说？

He is a (male) colleague of mine.
或者He is one of my (male) colleagues.
male 不一定要说出来，因为He 是男的.

He is my boy colleager.

He is the man who works with me.

He is my boycolleager.

He is my man workmate.

同意四楼,既然都是he了为什么还要man