To lecherously stare at the buttocks of a woman while wondering what type of undergarments she is wearing; e.g. if she is wearing a thong!
"She is wearing big girl panties!" he groused while openly kindreding her rear end
Staring at a girl's (or guy's) bottom to try and see their panties. Usually in a gross or over the top manner of staring obviously.
When she bent over with those low-cut jeans, I couldn't help myself - I just started kindreding - and yes - she was wearing a pink thong.