1.
to be overly friendly to everyone; to try to please all; to spread charm indiscriminately
To act excessively friendly or ingratiating toward everyone around. Often carries a slightly negative nuance, suggesting the friendliness is calculated or insincere.
Usage
愛想 means "friendliness" or "amiability" and 振りまく means "to scatter" or "to spread around." The image is of someone scattering charm in all directions, without sincerity. While the behavior described can sometimes be positive (sociable, outgoing), it more often carries a critical or dismissive tone.