Humorous phrase used to typically describe someone who enjoys lifting up the shirt of a shirt-wearer. Usually used to describe a homosexual man who does indeed lift up the shirt of a guy just before slipping his penis up the rectum of said guy, or just before taking another man's organ into his mouth.
E.g A man drops his pants to reveal his organ, but just before receiving a gobble from the gobbler, his shirt would require being lifted up, or even easier for the other man, taken off completely.
Dontay been spending a lot of time at those fruity male-only bars, he must be a serial shirtlifter that really loves cock!
A swiftlifter is a person of male sex, who very easily gets an erection. In some countries, such as America and Britain, this is seen upon as a blessing, because the average dudes there cant get an erection; normally the girls are to fat and/or ugly.
In countries like Norway and Sweden, on the other hand, it is seen upon as a curse. That is because all the girls there are hawt, so guys have no prob getting erections. In these countries, a swiftlifter is considered as a desperate fuck who aint gettin some.
1# Dude, check that lucky mofo out! He has erections like all the time! How does he do it, its like, all the girls here are ugly! He is like a total swiftlifter! OMG, I envy him soo much dudes!!
2# Folks, check that desperate fuck out! He looks like he never had some, he has like a constant erection! Its a swiftlifter, OMG!! Poor mofo.. I feel like sorry for him, my nordic fellows.