The brief period of time in a woman's life between young adulthood, and cougarhood.
Wow, look at her, she's a cougar. Well, not actually, she's more of a pre-cougar.
A woman who is in her 20s to early 30s and is interested in younger men. She may or may not be interested in keeping them as a boyfriend.
Wow, did you see her hustle that 18 year old boy outside the club last night? She's definitely a pre-cougar at 26.