"allow it" means to just leave something alone, or don't worry about it. People in West London say this quite often.
Ahmed: Wanna walk to the station?
Joseph: Nah, allow it blud, can't be arsed, I'mma get the bus.
by ak47 February 27, 2004
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widely used by working class youth amongst the london area. contrary to the standard definition of 'allow', the slang phrase 'allow it' is often exclaimed to express unwillingness, dislike or general negative opinions towards any given subject.

can also be exchanged for 'allow that', however this is generally considered an ill conceived middle class variant.
steve: yo i'm gonna change the track this one's bare prang

tim: oi allow it man!
by jesus fuckriest October 01, 2016
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something whiny school kids say when they want something they're not going to ever get
Student: miss, can we do an experiment where we get drunk and stuff

Sensible Teacher: no

Student: Oh miss, allow it!
by MissTerry September 17, 2009
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To say A-LLOW means eitha forget that or hell naw.
''shall we go and see wat dion and letesha are doin?''

''nah man allow dat dey probly shaggin each otha or sumthin''
by sonia_uk September 20, 2003
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-Let it be
-Forget about it
-Don't let it trouble you
-Don't even think about it
-Fuck that shit
-Don't bother with it
-Not now, some other time
-"Allow that bitch, she's rough!"
-"Want some next blast of this Bells, blud? Nah... allow that man, that shit's harsh!"
- "Come we go Wetherspoons, last place open round these ends at this time. init!" -"Allow that! That fucking place is full of old ropey, haggard cunts.
by SSmaug December 22, 2006
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Money given to white kids on a weekly/monthly basis by their white parents
Alice: Don’t your parents give you an allowance?
Rodoins: Bitch wtf is an allowance, fucking rich ass people
by Dhanwil November 10, 2018
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Many people have said that this word means 'leave it out' or 'don't bother'. We it does mean this but it is also used as a sign of agreement to a situation.
It largely depends on the tone
So it can either mean 'fuck that', 'can't be arsed' or on the other had 'yeah mate', 'lets have some of that'
If said in the negative term it would be said with a lowering in the pitch of voice towards the end of the phrase, if however said in the positive it would be said with a rise in the pitch of the voice towards the end of the phrase.
As well as this in the positive it is accompanied by the whip thing chavs do on the 'that'
Jim: Mate have u got dat new playstation game where ya like kill people
Ben: Yeah mate allow that (pulls off a whip)

OR

Benson: You know we gotta be up at 6am tomorrow!!!
Hedges: Allow that
by The Chicken Shack Crew December 17, 2005
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