I have a Pandas Series of lists of strings:
0 [slim, waist, man] 1 [slim, waistline] 2
You are basically just trying to flatten a nested list here.
You should just be able to iterate over the elements of the series:
slist =[] for x in series: slist.extend(x)
or a slicker (but harder to understand) list comprehension:
slist = [st for row in s for st in row]