Unbelievable Jeff 

A term popularised by Chris Kamara of Sky Sports News in the UK. It is used when in shock as though something is above unbelievable or near impossible

Jeff Stelling: "and we have a goal, Chris Kamara what's happening?"

Chris Kamara: "Emile Heskey has actually scored, and what a shot from outside the area, UNBELIEVABLE JEFF"

Unbelievable Jeff by Christinction May 28, 2013

Unbelievably Adorable 

To use when one cannot find a word to describe something really, really, really, really, really, really cute.

The way Maddie loves Eddie is unbelievably adorable!

Unbelievably Adorable by nina3beanie January 10, 2009

Unbelievable Tekkers 

Andy Ansah's version of "Unbelievably good technique" used on Wayne Rooney's Street Striker. Later used by Soccer AM.

Some Tekkers Are Good
Some Tekkers Are Bayyad
But Some Tekkers...
UNBELIEVABLE TEKKERS

"The Boys Are Coming In With Some Unbelievable Tekkers"

Unbelievable Tekkers by LewisFoster February 6, 2010

Unbelievable 

The cast of Six UK Tour 2020-2021 (Lauren Drew, Maddison Bulleyment, Carly Dyer,Shekinah McFarlane, Jodie Steele, Athena Collins, Cassandra Lee, Jennifer Caldwell, Harriet Watson) who is going back on tour after 8 months

Millie "I can't wait to see UK Tour go back!"
Emma "I KNOW! They are UNBELIEVABLE!!!"

Unbelievable by catherine.parr.1512 October 21, 2020

Unbelievable Benoit 

To perform a totally random, unnecessary, and unexpected attack of violence on a friend or family member.

To Benoit something maybe used when somebody is extremely hungry, whereby to benoit a sandwich would mean to get it in a crossface and eat it..

Man, Maglade pulled an unbelievable benoit last night!

Man, I'd benoit the fuck outa that one hey!

Unbelievable Benoit by sublamagee May 19, 2009

unbeliverable 

A project with no specification and a really tight deadline that no one can believe that we agreed to do it.

The project is fucking unbeliverable

unbeliverable by NoseBagUK February 3, 2017

Unbelievable Scenes 

when something very crazy or surprising happens, used in a happy context

Johnny brought his own beer to the party this time instead of stealing mine !, Unbelievable Scenes !

Look at that nerd tearing up the dancefloor ! Unbelievable Scenes !

Unbelievable Scenes by funnybloke April 15, 2012