Something that never fails to cause giggles from a group of my friends, and odd looks from others in the pub overhearing us:
Male friend, to me: May I stick my plug in your socket?
Context: We're all techy geeks, who instead of sitting at home on our computers meet in the pub twice a month (two separate pubs/groups although most of the members are the same). I am not as techy as the others, but I usually supply the four-way power strip to plug into the wall therefore they ask me if it's ok to use it! 5 or so young men, asking if they can stick their plugs into a fairly busty girl's socket!!
Of course, being all fairly dirty-minded individuals, this is not the only time we dress up phrases to sound dirty, almost everything we say is usually construed to be naughty!