Plural form of Twinsie: Pictures taken of oneself and another person.
Both persons will be mirroring each other's acts, poses, silliness, or
facial expressions as if twins. One of the two will be usually holding the camera with your arms
stretched out to take the picture (part of arm
stretched out can usually be seen in pictures taken). At rare occasions, twinsies may be taken using a tripod or through the help of a passer-by.
"Hey, have you seen Kaung's new
profile picture on Facebook? He took off his Selfie and
uploaded a Twinsie with his girl."
"Oh really? I didn't notice that. Most couples are doing Twinsies
these days!"
"Ya, not just couples, I saw friends doing that too now."