Vacation dick is either
1) Dick that you get on vacation. Having sex with someone while on vacation, or sometimes used to refer to dick you get when you're on vacation from your relationship.
2) The kind of dick you only want occasionally, or can only get occasionally. Often related to fuck buddies you don't see that often, or guys whose dick is particularly big/small/curved/whatever, and you wouldn't want to fuck them every day.
1) I got so much vacation dick during my study abroad!
2) Yeah, I got my fill of vacation dick while we were fighting. Now we're back together.
3) He's totally vacation dick. He calls once every two months, we fuck, and then we say "See ya in September!"
4) He had a total vacation dick. It was so curved, he was like a banana! We could only do, like, three positions without it snapping in half. You don't want that shit all the time.
Dick you get on weekends and vacations
Man I got so much vacation dick over the weekend
An above averaged sized penis that someone receives once a year. A rare occasion leading to euphoric feeling.
That dude I hooked up with last night, holy shit. Vacation dick.
Sometimes I just need a vacation dick.
The awesome dick you get periodically from your side piece. It's only so good because it's limited, taboo, and secretive.
Damn, I just met up with Brad, that vacation dick so good wish I could have it all day, err day.
A big dick from a reliable source you get when he wants to come thru.
Girl my vacation dick just called to come thru.
A dick that has an asshole person connected to it. But is big enough to make you like the person anyways
Lance and his friggin vacation dick.
boyfriend dick