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Explanation: Forth is a programming language that's notable for using backwards syntax, where the commands are placed in a different order than most other programming languages. So the joke is that he's saying "I love Forth", but he put the words in a different order to make fun of it.

More precisely Forth is a stack based language. So that sticker pushes l on the stack, then pushes Forth on the stack, then uses the heart operator on those two stack entries. It looks weird and backwards to humans, but that style of programming is extremely resource efficient on the computer.

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