What are dubs?

What are dubs?
I've seen a lot of threads saying "dubs for nudes" but don't know what they mean?
Is it some sorta currency here on Sup Forums where you pay the OP or some shit?
Please explain?

Ur a fag

PS check em

??? What?

check em

What does it mean?

Lurk moar

checked

Chekt

Now check dis

Same i dont fucking know what is dubs and check em

Check em

Check em.

Check em

Check deez

Check em trips

Check em boys

It's the digits at the end of each post.

You are all roodypoo newfriends.

Check 'em boy

Y̴̼̼̯̖̱̲̠̭̘̦̠̪̬͍͓̗̓̉ͬ̍̀͜ͅơ̟̤̮͕͕̤͖̝͇̰͕͙̟̯̻̝̻̓͊̂ͧ̑ͯͭ̑̽̂ͬ͂͘ùͫ͊ͩͣ̆̈́͋ͯ̚͝͏̵̨̘̱̖̼ ͌ͤ͌ͣ̇̅͑̓ͨ̆ͤ̌̀̋҉̴̸̡̦̜̱̥̹͙͝a̋ͣ͋ͩͫ̿͒ͪ͗͛̉͑̋̽̒̋́̚̚҉͓̙̲͎̟͈̘̻r̡͙͍͓͙͍̖̘͖͓̫̪̥̮̭̞̝̜̉͑̄̉̓̿̐̀̿̍ͤ̄̋̃ͦ̅̒̾͆ê̸̷̩͚͕͔̲̩̖̂̒̆̃̓̆ͣ̇̌ͣ̾͋̓ͩ͜͡ ̸̴̮̺̘̆̽̏̏̏ͫ̀̕ȁ̸̛̭̝͙͎̖͍̗̯͔͔̘͐̎͐ͦ̉ͬ̔͌̅͜ͅ ̴̨̨͍̱͖̘̥̭͔͇̼̮̏̾̈́̓̿͒ͨ̏̓͋ͭ̀̽̐̀̚͢ͅF̸̨̨̦̦͔̭ͭ̓͂̎̈ͬ̓͌͂ͬ̈̑ͫ͞͝a̷͇̮͕̤̖̖̤͕̺̲̬ͨ͗̓̍͐͛ͬ̒̅̈́̚͘͘͞ģ͕̤͇͇͈̭̠͌͛ͭ̃͊̇̆̑͌͌͂̓͛ͩ̑̚̕͜͞g̡̬͍͚͉̜̯̑͐̓̽̌͛̇̀̾ͬ̓̊͟ͅŏ̷̡̘̠͖̥̦̝̺̪͎͔̫̰̼̼̼͕̮̻̆ͧ̓͗ͯ́͟t́͒̔ͮ̑̔ͩ̈́ͮ̇͛̃̔͑

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This bread is stale

Thank you for this. The bait was to EZ...