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Speaking to TV Guide, Smulders explained that Happy Town star Geoff Stults will appear in the new season's fifth episode.
Stults will reportedly play Max, whose name is short for Maximum.
"He's very well-endowed," Smulders said. "[Robin] shares that with her friends and I believe the word 'gherkin' is used."
However, rumours have suggested that something will ruin Robin and Max's date.
How I Met Your Mother returns for a new season on Monday at 8/7c on CBS.
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