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2.
Annoying phrase that many people on YouTube say to try to get people to subscribe to their channel. It works by guaranteeing that if someone subscribes to their channel, they will subscribe back. People do this to try to feel like they are important and so they can brag about how many subscribers they have. They also do this because they say that if you have enough subscribers, YouTube will pay them to make videos. It will never happen because most people do not care about the sub4subers. It has gotten so far out of control that some people have made accounts whose sole purpose is subscribing to people hoping that they will subscribe back. It usually doesn't happen.
isubscribetoyou: sub4sub anyone? I will subscribe to anyone!!!!!

intelligent youtube-goer: No one cares about your meaningless subscribing account. Just shut up!

isubscribetoyou: *cries and goes to another video or channel in the hopes of getting subscribers but fails miserably*
by iduncurr May 16, 2009
 
1.
or "sub4sub" / "sub for sub"

Abbreviation for "Subscription for Subscription" on video-featured websites such as "Youtube.com".

Sub 4 Sub is a request to subscribe to your profile with a guarantee to subscribe to the subscriber's profile.

Essential for nerds with small self-confidence.
sub 4 sub any1 ? please rate ma new video!!!1
by Lex Hundt May 14, 2008
 
3.
sub4sub is a term used on the Video Sharing Website "YouTube"
to say "sub4sub" to another user means that if that user will sub (subscribe) to your videos, you will sub back to theirs, It may sometimes be posted as a comment on any random video to be pointed towards any user that's stupid enough to get sucked into it, Many sub4sub's are ignored, or marked as spam
"Hey YouTube users! sub4sub?!!?"
"Dude, GTFO, no one wants to sub you, your videos suck anyways"
by X172 April 11, 2009
 
4.
A popular word among youtube users meaning subscription for subscription. People trade this like pokemon cards.
weeaboo: sub4sub?
smart kid: fuck you.
by Mike Sandy betch July 25, 2008
 
5.
A popular phrase used on YouTube. When you ask someone for a sub4sub, you subscribe them, and they subscribe you, in result, both youtubers gain a subscription. Unfortunately, a large amount of youtubers that do this are kids who have awful videos or (god forbid) no videos. Those who have awful videos just want attention. Those who have no videos look like complete idiots each time someone sub4subs them, looking more and more like a chode. They have yet to realize this. It is rare when a person with good videos asks for a sub4sub, because they usually do not need it. These Sub4Sub whores are usually found on Fred's channel.
StupidKid1: Hey dude wanna sub4sub?!
RegularUser2: No, your videos are horrible, and I don't need to sink to your level to gain subscriptions.

StupidKid2: SUUUUB4444SUUUUBBB?!
RegularUser2: You have no videos. Why would I subscribe to someone who doesn't have any videos? You are a failure.
by The Motherphucker June 20, 2010
 
6.
It's a term for use at Subway restaurant's, where one customer, who is generally not satisfied with his sandwich, asks another Subway customer if they would like to trade sandwich's of equal value.
Customer 1: Oh no, I got mustard when I wanted mayonnaise!
Customer 2: Hey, sub4sub?
Customer 1: Yes, of course!
by generalLEEwrong September 20, 2011