De Vet Du (literally You Know It in Swedish) is a Swedish music group formed in 2010 mixing humor and sarcasm in their music. De Vet Du, or at times De vet du started in Lidingö, a suburb of Stockholm by three friends Christopher Martland, Johan Gunterberg, Tor Wallin, and the so-called "DJ Hunk". They are signed to Universal Music Sweden.
Originally the members started online, mainly on YouTube uploading funny videos under the title "Lidingobladet" and soon became online sensations. Moving to music and humor they posted their first video "Dansa Är Kul (Men Jag Föredrar Å Supa)" (meaning Dancing is fun, but I prefer to drink in Swedish). With further, quite often risqué titles and explicit lyrics (particularly when heard in other languages), they released their debut album Shit Va Pin in 2012 and from that album their charting hit "Fucka Ur" that charted in Sverigetopplistan, the official Swedish Singles chart. It was followed up by another charting single "Kär i en kändis" in 2013.
Their regular online postings full with tongue in cheek humor, puns and self-deprecating hilarious criticism of social phenomena attract a big following including songs like "BoyBand", the album title "Shit Va Pin", "Hon va en han", "Sture P", "Bågar Utan Glas", "Din Syrra". They also cooperate with many others and habitually feature them in the videos like in "Haterz" featuring Robert Aschberg and "Dansa Är Kul (Men Jag Föredrar Å Supa)" featuring Robin Svensson etc.
De Vet Du is featured in Björn Borg commercial particularly the memorable "Boxers or Briefs" series.