The act of constantly whining and making "MERRRRR"-like sounds in order to get exactly what you want.
Usually followed by a high pitched laugh and complete denial of ones own demanding
If demands are not met, demander gets in a BIG FAT MOOD until you feel guilty and give in to the demand.
Lacey: Give me your cardi
Lauren: But im cold
Lacey: Your so selfish, im cold
Lauren: MERRRRR demand