Slippin

Losing momentum, lacking in a particular task or job, degrading.

Man, you're slippin at work.

Slippin by Broken June 14, 2004

Slippin

Where you're not on your regular level.... pretty much the same thing as "Trippin"

Aye you slippin ma foreal!

Slippin by Konnie November 4, 2006

slippin

to be high on ambien and acting the fucking fool.

"dude, last night you were slippin and ate an entire pizza and slept with your ex girlfriend. you are fat and have herpes now!"

slippin by Spaggy December 28, 2007

Slippin

The art of fucking up/doing wierd shit/while high or intoxicated on any form of drug

Bro look at this Nigga he's Slippin super hard.
You Slippin Nigga?

Slippin by Blackk jesus August 13, 2015

Slippin

When you're messing up and fucking up

*Alison drops and break your favorite mug*
COME ON ALISON WHY YOU SLIPPIN

*Joe sits on the remote and changes the channel during your favorite scene of a movie and you can't rewind it.*
Joe you're slippin right now don't slip again.

Slippin by MysteriousJaneDoe May 23, 2018

slippin' 

being caught off guard

One might say,"I'ma catch that foo' slippin' one day an' bust his ass!"

slippin' by Silent Ninja c1998 July 15, 2003

Slippin’

When a different outcome was intended

I just got caught slippin’.

Slippin’ by PsiChi July 2, 2021