The word whole is usually used by stan Twitter even it's not necessary. It means entirely, full, all parts of, etc. It depends of the sentence where it's being used.
"She really gave birth to a whole baby"
"Whiplash by NCT 127 is a whole bop"
BDS, a term commonly seen being used on stan Twitter, stands for "Baby Don't Stop", a song by NCT U's Taeyong and Ten.