"your gay Aunt" describes a Person who is not too fussy about doing things properly. This Person might just not be too botherd about someting or is just too lazy to put in too much Effort.
Your gay Aunt would not bother to use Fresh Herbs when cooking, the Dried stuff is just fine.
It needs to be mixed right in the first place, your gay aunt or your Thanoshat wearing cousin is never going to bother to do this.
This is a phrase used when also pointing at the floor 'you dropped your gay card" the other person automatically looks at what your pointing to, without realising what you said. When they realise that they are looking for their imaginary gay card on the floor they feel very stupid, but very funny to everyone else.
Person 1. (points to the floor) Geoff you dropped your gay card!!