An effeminate man. Particularly one who permanently appears to be wearing lipstick and rouge.
James is definitely a Jimbler. And look at that hat he's wearing!
A penis. The word was popularised in parts of Cambridge University in late 2006 and has now entered the popular lexicon. The first known individual to use 'Jimbler' for 'penis' is thought to be a male graduate student at Darwin College.
'I've got timber in my jimbler' (I have an erection)