It means killing yourself.
Suicide.
Sara: Ah Jen i'm so depressed!
Jen: Please dont go Topping yourself Sara D:
Sara: Im considering it
Jen: We all love you, this isnt right -cries-
19👍 9👎
To kill yourself
Renton: "You feel so fucking low, you want to fucking top yourself."
129👍 22👎
A Tuesday that is, or is going to be, so bad you are tempted to commit suicide, or "top yourself"
Joeys student 1: OMG, we have an English task first Tuesday back!
Joeys studnet 2: Fml, get keen for Top Yourself Tuesday everyone!
28👍 5👎
To commit suicide/ kill yourself
Mark Renton : And once the pain goes away, that's when the real battle starts. Depression, boredom... You feel so fucking low, you want to fucking top yourself.