The bicep lock or bicep slicer is a terrible submission to caught in.
The technique is a compression lock where the biceps is pressed into the humerus. The opponent usually uses their own shin or forearm as a fulcrum on the victim’s arm. The technique comes on very fast and often the opponent barely has time to tap.
In BJJ, biceps slicer are illegal until brwn belt, under IBJJF.
If you tap out too late, this is what happens to your bicep: torn bicep…
Here is a powerful counter to the bicep slicer, that really works: