Creating a type of 'nest' with people (usually 2 or 3) instead of birds and pillows, cushions, duvets mattresses instead of twigs. Taking lots of ketamine and watching weird trippy visuals on tv or laptop.
Ket nests are usually created after a night of partying with lots of people because the person wants a relaxing come down in a chilled out atmosphere with close friends, comfort and warmth.
There can be variations on the ket nest such as 'festive nest' (ket nest at Christmas time) etc.
Im tired of this party, shall we go home and make a ket nest?