I hope this doesn't break any of the guidelines--it was coined by a friend of mine in Germany, where lots of people are militantly eco-friendly and make a statement by wearing alternative style clothes. We thought the pullovers a lot of these eager young men wore looked like something their mothers or grandmothers had knitted, which went loose and baggy round the bottom when washed--hence looking frilly. From this came frillover to describe someone who is rather green, possibly vegetarian, and a bit of a dreamer. Example: Don't use plastic cups at the seminar, some of the frillovers might not like it. We should buy cups that we can wash up or use paper ones that we can recycle.
FRILLOVER
Meaning of FRILLOVER in English
Slang English vocab. Английский сленговый словарь. 2012