When someone "clamps" you it means your wrong and you cant make a come back.
Man 1:Ourfootball team is better than yours
Man 2:No it isnt we totally kick your teams ass
Man 1:Thats why we beat you 5 nil and won the league then
Man 2:Ye but..but..but...get lost you asshole
Man 1:Ha Ha your clamped