To catch a large fish. The word comes from the slapping action of a fish as its being reeled in. Bass, Tarpon, Snook are all known for "slappin" the water as you pull them in.
"Man we were slappin' today. The bass must've been hungry"

"(Insta pic) Great day on the lake #slappin #killemandgrillem"
by killemandgrillem69 October 16, 2013
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reference to a cool item of clothing, somthing that someone has done that is particularly sound, or anything you want it to mean. it comes from the BENglo-Saxon word 'Slah-pin' which means "cradle of the dusty rat".
d00d, that is totally fuckin' slappin!!
by Ben Holt June 14, 2004
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(noun) it's the newest smack talk code in middletown, ct
As PGRAB walked by, SCUB was so slappin all the way down the hall. Little did PGRAB know that SCUB was trash talkin her. SCUB was slappin', aka talking smack in code.
by ENRICApole March 17, 2009
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Slappin is midwest slang used to describe any noun that is extra cool.
Yo I just got new suspenders..they be slappin
by Hurts58 December 25, 2016
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