Nearly none, in slang

• Nothing much, to weightlifters?
• FA team in pub, possibly swapping tips!
• Least amount
• Worthless amount
• Exercise that's not worth much?
• The least amount
• Very little, in slang

WordNet Word definitions in WordNet
n. a small worthless amount; "you don't know jack" [syn: jack , diddly-squat , diddly-shit , diddlyshit , diddly , diddley , squat , shit ]

Wiktionary Word definitions in Wiktionary
n. (alternative form of diddly-squat English)