A signature shirt or sig shirt or SS is a shirt that a person in a picture wears usually on purpose. This is sometimes a person's ow custom shirt but mostly it's not. These are usually validated by a myspace whore or a just a man/woman looking for a hot date. sometimes it cld be just a bikini top (hopefully only for a girl)
by Hellhound9210 June 23, 2009
Get the Signature Shirt mug.A body type resting in between a dad bod and a body type you would actually feel comfortable with whilst being shirtless in public. Looks at least passable in a t-shirt, hence the name.
Guy 1: Hey man, you been eating better? You look like you dropped some weight.
Guy 2: Yeah. Upgraded from dad bod to t-shirt bod!
Guy 2: Yeah. Upgraded from dad bod to t-shirt bod!
by Anonymous900000000000000 September 22, 2019
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