a person who is lacklustre in responding to emails, text messages, or basic conversation
Shannon, why did you respond to my paragraph-long email with an "lol". You're such a soggy potato!
When a man with a limp dick tries to give anal to a woman or another man,trying to stuff his flaccid penis into the asshole.
Dude I totally wasn't getting hard for this fat bitch last night,so I just gave her a soggy potato.