A person who enters some event without a ticket or invitation, either by stealth or by deception.
The groom or one of his groomsmen when partaking in the gatecrashing ritual of a traditional Chinese wedding.
A badly adjusted person; someone unsuitable or set apart because of their habits, behaviour etc.
She was very unhappy in Iraq and a misfit in the Army.
A failure to fit well; unsuitability, disparity.
To fit badly.