Babushka- is it slang for a bad name or derogatory term in Slavic languages?

I got in trouble today for calling my friend this as a nickname,it was said over a walkie talkie we use at work, I only know it as a funny name, as in, funny to hear and pronounce, but my manager said other people might hear it and get offended as it means bad things is some languages!!!!!!!!! Just wanna know if this is true, checked it out on Wikipedia but it didn't mention anything.