Diffing 

- refers to a culture of people with rear wheel drive vehicles (usually ae86 corollas and S-bodied nissans) meeting up and doing donuts at crossroads, shopping centres and industrial parks, especially late at night. It`s seen by some as a starting point towards drifting where people can learn how to control a slide without serious risk of injury, but is widely sneered at by mature drivers.
People interested in diffing(differs) tend to be very young drivers who cannot afford to attend drift events and see diffing as a way of being able to be involved in the modified car scene.

Are you coming out diffing with us tonight?

We were at a (insert cruising forum name) meet last night and Dave was diffing his brothers twincam.

Diffing by tarmac surfer September 7, 2009

duffing up 

duffing up is the female equivelant of beating up, or kicking ass. It's not so violent in a sense, and to a certain degree. It usually involves excessive screaming, clawing, pushing, and shit-talking.

ali is effing duffing up mandy, alis guna win, mandys so screwed.

duffing up by Ali Lansing July 15, 2006

Deffing 

1. To be worried or scared about something, frequently used to describe a drug-induced state of paranoia.

2. To vomit.

Origin: Great Grimsby. Possibly originally evolved from the word 'defecate', via 'shitting it'.

1. 'I'm deffing', 'She's deffin'-out', 'I deffed-out', 'Deff-out'

2. 'I just deffed'. 'He's deffin''.

Deffing by spacecaked March 31, 2011

Doofing 

1. When there's this doof, usually named Ryan, that keeps saying stupid things in the context of group texts or social media.

2. When someone (often named Ryan) means to text their significant other a sappy message, but instead sends it to a group text with all their friends.

1. I heard people have started blocking Bryan from that Live Music group text, because he was constantly doofing the threads.

2. Ryan, stop doofing our thread with your lame emoji texts to Nikki!!!

Doofing by Dongknuckle April 18, 2017

Diffing 

When a group of knob heads gather to wreck their cars by spinning around in circles, usually done by joy riders from west belfast and little boys who think twin (tin) cams and old beemers as old as the hills are cool

diffing - does she go round mister..

Diffing by diffin is for losers August 19, 2008

duffing it

Masturbating, jacking off, spanking the monkey, slapping the ham, whacking off, or beating your meat.

Did you hear that ryan was duffing it in the middle of class the other day?

Duffing it isn't a crime.

duffing it by con09 November 17, 2009

duffing it

to masturbate

This stems directly from Hilary Duff.

I walked in to my dorm and caught my roomate duffing it.

duffing it by Zane U. September 11, 2005