BASIC is the acronym for Beginner's All-purpose Symbolic Instruction Code which is a programming language developed in 1964.
BASIC is a very common language that can be used for development on almost every operating system. Versions of BASIC such as VBA, VB6 or VB.NET are very commonly the first programming language learned by people who now program for a living.
Since VBA was the scripting language included in every copy of Office since the 1990s, it is very common for companies to come to depend heavily on applications written around Excel or Access. Because these applications slowly grew from something that one person needed to get done, into something the company now needs to survive, many developers have come to hate BASIC and everything it is included in.