Toking up 

"Toke" is a noun. It means a "hit" or "puff"
-Take a toke from the pipe.

"Toking" or "Toking up" as printed above, is a verb. It means to take a hit or a puff from the pipe.

-We were outside in the backyard toking up some fine medicinal cannabis.

So,
toking = smoking
&
to toke = to smoke
and therefore,
Toking up = Smoking up

I do believe that it is actually an older term more used back in the 60s and 70s.
A hippie once said, "yeah maaan, we were at Woodstock toking up Mother Earths gift to us!"

After toking up some weed, all my anxiety just melted away.

Toking up by SIZ777 December 20, 2016

toking it up

Smoking or in anyway consuming Marijuana.

When I get home from work I'm toking it up.

toking it up by Dadsthetic October 1, 2016

tokin up 

To toke is the action of taking a hit of marijuana, therefor, tokin up means to have a session of smoking marijuana. You can toke on a joint, or take a bong toke, and from this comes the phrase "tokin up".

The three of us are tokin up before the movie tonight, so we can get our mind right before it starts. I prefer bong tokes, but since we will be doing in the car, it will be easier to toke on a joint.

tokin up by GhengisFong September 30, 2016

TAKING UP THE SLACK 

Discribes the moments before passing a huge turd or "windjammer"

To bend the door handle whilst taking up the slack

TAKING UP THE SLACK by Paul January 12, 2004

tokin up 

licking cum out of a mans ass.

ELIAS WAS TOKIN UP THIS WEEKEND WITH BRUNO

tokin up by radonrandell October 2, 2016

Taking up legs

The equivalent of walking somewhere

Rhiann: what's happening this evening then?
Josh: we're taking up legs t'spoons

Taking up legs by Riri53 October 20, 2017

Taking it up the ass 

Being taken advantage of in a variety of situations. As if you're bending over, you're in a kind of vulnerable situation where people can easily shove stuff up your ass, and you're taking it with a faint smile.

If he rents this shitty apartment for as much money as their asking, he will totally be taking it up the ass.

Taking it up the ass by Jamie M. September 28, 2005