The Origin of the Term “Junk DNA”: A Historical Whodunnit (2013)

For what it's worth, by 1988 the term was in SF novels such as David Zindell's Neverness

the whole concept of "junk dna" is hilarious to me and is emblematic of the main problem with modern science, where everything we don't understand yet is either not real, not possible, or not relevant

From 2013