Not the bicep muscle, but the tendon - and with a distal bicep tendon tear the bicep retracts and you end up with a popeye looking upper-arm. It doesn't always .
Have to get advice from a gym trainer. Nothing to do with medication or medical condition.
British slang: To wank is slang for masturbating, usually understood to be carried Wanker's Cramp is likely the most pathetic accidental self-inflicted injury of all.