Nothing But TroubleNBT means "Nothing But Trouble". Shorthand for "Nothing But Time" or What you say when one person is freaking out about there not being enough time to accomplish a task but the other person. Looking for online definition of NBT or what NBT stands for? NBT is listed in the World's largest and most authoritative dictionary database of abbreviations and. Looking for the definition of NBT? Find out what is the full meaning of NBT on Abbreviations. This page is all about the meaning, abbreviation and acronym of NBT explaining the definition or meaning and giving useful information of similar terms.