A boring type of anime where it seems that the characters frequentlyliterally sit on a hill, a balcony, or valley and stare into the sun and not talk while sitting next to each other. Can also generally describe any boring anime.
When it gets to be summer time and people get sun fever thinking they can wear whatever they want...Fun in the sun mostly refers to bigger people who walk around with clothes that are too small and they think because its hot, its ok.
Sun can be an interchangable word like fun in the club etc