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When some guy gives you a blumpkin because he's doing a L stand and you're the one who got stood up.
You: 'I'm coming to the party.' Him: 'No way.' You: 'Why?' Him: 'I'm doing a L stand.'
You text your ex: 'I'm coming to the concert.' He replies: 'You're not. I'm doing a L stand.'
You walk into class and the whole group laughs. Someone says: 'He did a L stand on you.'