Sex juices, particularly semen, that head downhill due to gravity if a women stands after sex.
I tested my daughter's panties with a kit from www.infidelitytoday.com and found something that shouldn't be there.
by Nathan March 31, 2003
1 more definition
the biological term used by sexologists to describe semen leaking back out of the vagina after unprotected hetero sex is flowback
I rolled over into the wet spot, woke up, and cursed the flowback.
by Nick Mass January 27, 2005