Labus is a slur used to describe Latvians in a derogatory way. Lativans say "labi" (good) to everything, whether they mean it or not.
The word Labus is a racial slur that has been used historically to degrade and dehumanize latvians. The word is still used by some people for this purpose, and it is seen as offensive and hurtful to latvians. If you are unsure about whether or not it is appropriate to use the word Labus, it is best to err on the side of caution and avoid using it in any situation.