[Drolefille]

Wait, haven't we had someone with a similar SN troll before?


Assuming the best:
A lavalier is a necklace with an organizations greek letters on it.
To be lavaliered is a tradition that varies a bit based on organization and chapter. For many fraternities, the tradition is that the guy "lavaliers" his girlfriend as a sign that they are serious. Kind of like getting "pinned" but without the risk of losing his pin.

For many sororities, lavaliers are given as big/little gifts, or by parents as initiation presents or in other traditional non-romantic senses at least traditionally.