The Collaborative International Dictionary of English v.0.48:

cul \cul\ n.
   a contraction of cul-de-sac.

   Syn: cul de sac, deadend.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

cul
    n 1: a passage with access only at one end [syn: cul, cul de
         sac, dead end]

V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

CUL
       Computer Und Lernen (org.)


V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

CUL
       see you Later (slang, Usenet, IRC)


The Free On-line Dictionary of Computing (30 December 2018):

CUL

    "See you later".

   (1997-12-01)