Cuke is a short form of cucumber... The slang use of cucumber or cuke usually is about the subject being inexperienced. Since, cukes are green and a way of describing a newbie is as green like an unripened fruit.
The flowers may be male since cucumbers have sexual distinct flowers i.e. either male or female!Climatic or nutrient deficiencies can also result in flower abortion prior to or after pollination.
You have Slang because it's fun and a faster way to talk It is also for the lazy , semi-literate , and those wishimg to obscure their conversations from parents or other authority . its quicker and u...