It means the first thing that comes to your mind(usually along the lines of sex, alchol, drugs, weed, etc) It should be used when you want to do a combination of the previous things listed or if you want to do anything that will entertain.
Yo Lets get laddered tonight!
Dude I'm so laddered right now.
Yo I laddered that chicklast night she was awesome.
Yo I got weed in my car wana go get laddered?
Lardered (verb) - For a male to partake in sexual intercourse with a plus sized female or vice versa. Usually involves the larger person incorporating their excess rolls into said act.
'Lardered'
To get told to smarten up your uniform by a male teacher. This involves tucking your shirt in and pulling your tie up.
Occasionally this will also involve removing non-school uniform and putting on your blazer.
boy1: what have we got next?
boy2: not sure
teacher: Oi! Get your shirts tucked in and smarten up!
boy1: ughhh...
(a few moments later)
teacher: right now if your teacher asks where you've been, tell them you got lardered