About the band: their web site (Portuguese)http://www.tequileiras.com.br/
This dance involves a guy sitting on the floor in "L" position with a lady grinding her butt in his face to the song "surra de bunda". The woman is usually wearing a thong or occasionally briefs or tight pants. A distinguishing part of the dance is when the song goes "bate com bunda bate com bunda" she will put her feet on the guy's shoulders with her hands on his shins and bounce up and down by bending her knees (sometimes violently rocking his head back and forth and pushing his face into the butt). It has been imitated by many on youtube after the bands original dance.

The song:
The title "surra (pronounced like "suha") de bunda" (Portuguese) translates to "butt spanking" in English.
Que safado, tá gostando!
Tá achando muito bom…
Vendo bunda rebolando e descendo até o chão!
Tá achando muito facil
Com a tequila, tá chapado
Deixa ele experimentar…
A nossa surra de bunda!!!
Bate com bunda, bate com a bunda!
Bate , bate, bate ! Com a bunda!!!
Bate com bunda, bate com a bunda!
Bate , bate ! Com a bunda!!!
Essa é As Tequileiras, dando uma surra de bunda!
Bate com bunda, bate com a bunda!
Bate , bate ! Com a bunda!!!
Bate com bunda, bate com a bunda!
Bate , bate ! Com a bunda!!!
Essa é As Tequileiras, dando uma surra de bunda!
Translation by me:
What a pervert, (he) is liking.
(He) thinks it’s very good,
Seeing butt swinging around and going down until the ground
(He) is finding it too easy,
With the tequila, (he) is high
Well, let him try…
our “surra de bunda” (butt spanking) !!!
Hit with butt, hit with the butt!
Hit, hit, hit! With the butt!!
HIt with butt, hit with butt!
Hit, Hit! with the butt!!
This is “as tequileiras” giving a “surra de bunda”!
Hit with butt, hit with the butt!
Hit, hit, hit! With the butt!!
HIt with butt, hit with butt!
Hit, Hit! with the butt!!
This is “as tequileiras” giving a “surra de bunda”!
*notes:
-bunda was translated as butt, but “ass” would be fine too.
-There is an (intentional) grammatical error: “Essa é as tequileiras” should be “essas são as tequileiras” (“This is” should be “these are”). Probably to identify the song with the street and favela language.

Google insights:

North American immitations:

A child doing the dance (solo):

A Fursuiter doing the dance (solo):

Reaction:

Featured in the mainstream media:
http://www.thedailyshow.com/watch/mon-june-7-2010/moment-of-zen---surra-de-bunda
Song Remixed:

Leave it to Dutch People to remix and make even more disturbing with video editing and studio filming… A music Video:

at a wedding