(first) dibs (on something)
slang The rights to something, or the rights to have first choice of something. "Dibs" are usually claimed verbally. I call dibs on the front seat! Hey, I had dibs on being first in line!
See also: dibs
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
dibs on something
a claim on something. I've got dibs on the yellow one! Dibs on the front seat!
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.