Awesome: anything at all encountered by anyone under 30. Often written in UPPER CASE for heightened effect. (e.g. 'This tea-bag is absolutely AWESOME!!!!') Other forms: awesomest, awesomeness, awesomely.
Well wicked: Extremely good.
Well unwell: Very sick.
Devastated: Emotional condition evoked by anything bad - from the loss of a football game to failing a 'Britain's Got Talent' audition to being evicted from the 'Big Brother' house to a tragic death to a plane crash to a tsunami to a famine to a war to a 50-megaton nuclear explosion to a 10-mile wide asteroid colliding with earth.
Oh my God! Standard English prefix to anything at all - most often used by younger women, but not exclusively. With men, it's more usually 'Fuck!'
LOL: first name of Mr Creme, of 10 cc and Godley and Creme fame.
ROFL: Mr Harris's first name, mis-spelled.
OMG: Shortened form of '80s electro band Orchestral Manoeuvres in the Gark.
OMD: Shortened form of French prefix 'Oh Mon Dieu!'
BGT: A bacon, greengage and tomato sandwich.
WILFS: Short for 'Wankers I'd Like to Fire.'