The term "porra" appears to be a misspelling or a regional variation of the English word "f**k". In a porn video context, it is used as an intensifier and can mean various sexual acts. For example:
- Porra (intense) orgasm/squirt
- Porra hardcore sex
- Porra rough anal play
Please note that this is not a specific English term but an approximation based on the context it's used in. If you meant another language, please provide more information for a more accurate explanation.