What does /4 mean when there's nothing before it to slide up from? For example


This is from a tab for losing you by the john butler trio
You slide from somewhere to the 4th fret. When you put down your guitar flat on you lap, imagine like a plane lands on the 4th fret, coming from the nut
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You can tell if it's eager, because you put your hand down her pants and it feels like a horse eating oats.

Nicest compliment on my looks:
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Putting the 'sex' in 'convicted sex offender'.