Claim: Floxing is a term used by scientists when they want to revive an inactivated gene in a specific tissue in vivo, at any time, in order to identify its normal function.
Evidence: In genetics, floxing refers to the sandwiching of a DNA sequence (which is then said to be floxed) between two lox P sites. 
In layman's terms, the gene can be knocked-out (inactivated) in a specific tissue in vivo, at any time chosen by the scientist.