Leafing: Removing leaves from your plants in encourage growth.

Lid: One US ounce of weed.

Limbing: Removing lower limbs (of your plant) to encourage growth.

Lit: To be in a very high state of mind.

Little John: New Zealand term for a two paper joint.

Log: Big joint.

Louis: UK slang for a sixteenth of an ounce of cannabis (as in Louis the  XVI).

Lung: English term for a 2 Litre plastic bottle with a poly-bag attached to the bottom. When the bag is pulled out of the bottle the smoke fills it up.