Gandalf 

Someone who is standing in the way, preventing you from passing through a narrow area.

OK Gandalf, let's get moving here buddy.

Gandalf by thricegreatart May 24, 2010

gandalf 

santa on crack

you shall not pass!

gandalf by lewis June 14, 2004

Gandalf 

To come back from the dead in a spectacular fashion, normally just in time to save someone's ass from getting kicked. Just like Gandalf in LOTR.

I was sure he was dead after the nuke went off, but he did a Gandalf and saved Bauer's ass.

Gandalf by pasdaddy May 7, 2009

gandalf 

The coolest character in the Lord of the Rings

Frodo: Hey, Gandalf, how do I get rid of this god damn ring?
Gandalf: My friend, you have to touch yourself at night without wearing the ring.

gandalf by God July 21, 2003

gandalf 

one of the many Hobbit themed cocktails available at the pub of the same name, in Southampton. Contains vodka, archers, blue WKD and lemonade. Very refreshing. £3 for a pint. I love them far too much.

"Mine's a Gandalf, please"

gandalf by Jez March 7, 2005

Gandalf 

All of the above.

Gandalf is the Mac Daddy of Middle Earth!

Gandalf by Jeff Chislett June 2, 2004

gandalf 

Coke or cocaine in powder form. The color of the substance resembles that of Gandalf's outfit after his transformation from grey to white.

Sam: I was up all night. I might have to take a nap after breakfast.
Bil: No dude, just take a hit of gandalf and you'll be able to at least make it through second breakfast, elevensies, luncheon, and afternoon tea.
Pip: You shall not pass out.

gandalf by scoobysnatch January 9, 2013