Definition of kicker: Advantage or benefit demanded by a lender, or offered by a borrower, to 'sweeten' a loan deal. In real estate loans, for example, a lender. Sure, renting an apartment is cheaper and gives you a lot of flexibility to move around, but here's the kicker: with the money threw away renting. This Slang page is designed to explain what the meaning of kicker is. The slang word / phrase / acronym kicker means . Online Slang. Get Free Newsletters Newsletters. Origin of kicker Expand. I'd usually use the term kicker to refer to any highly off axis light which strikes a glancing blow on the subject. Meta Stack Exchange Stack Apps Area 51 Stack Overflow Talent. Die vom Verbund " European Sports Media " ESM erstellte europäische Torjägerliste.