Doing it live

Used for a situation where you have not prepared at all, or are not planning on preparing.

Cameron: Nick, did you study for the science test?
Nick: Nope, I'm doing it live

Diddly-do

A woman's vagina

Wow, Rachel's diddly-do is a freakin bush! When was the last time she shaved?

Doing a Kendall

When one acts like Jack Kendall by vomiting a lot after drinking one Smirnoff ice and a spending the rest of the night with his head down the toilet.

James: "Have you seen Mike?"
Benny: "Nah man, he's doing a Kendall"
James: "What a cunt!"

Steve: "That party was off the fucking chain last night!"
Jarad: "I know man, I drank so much I nearly ended up doing a Kendall!"

fair do's

Informal, often used in UK. Something you say when something is reasonable, similar to fair enough.

"Sup"
"Nothing much, you?"
"Vibin"
"Fair do's"

(Doctor Who)
Wilfred: You know, I don't understand half the things you say these days.
Donna: Nor me.
Wilfred: Fair do's. You've had a funny old time of it lately.

Doing the Least

The oposite of Doing the Most. When someone has given up and isn't even trying at all.

Girl 1:Why is the bartender wearing yoga pants and no makeup?
Girl 2: She's doing the least.

Do-Flan

Where you decide that yourself and ya brah are pulling out da flannys for a special occasion. (Flannelette shirts)

Ay brah, do-flannin tonight?
Brah: yeh fam

Do it for Dale

Dale Earnhardt (1951-2001, NASCAR driver) was for many an example of how a common man can achieve great things if one makes enough effort, and takes the chance whenever possible.

As so, "Do it for Dale" means something like "He'll be proud of you, so do it."

"You wanted that job, right? Do it for Dale!"