Eye dialect spelling of get it. (As in, "do you understand the humour?")(phrase)
Wiktionary.org : Text is available under the Creative Commons Attribution-ShareAlike License
Use "geddit" in a sentence
"Isreal's actions today are one of the few news items that actually give me hope that there is at least one Western nation that actually does "geddit"."
"Accusing Araucaria (oops sorry - I meant to say "The rev") of nodding on his Homer (pretty smart allusion there eh - geddit?) certainly takes some cojones."
"Dr Ros Altmann, Saga director general, was also highly critical of the Bank's move - comparing it to "launching the Titanic" rather than the Queen Elizabeth II liner, geddit?"