New here- can someone please explain the abbreviations

Here are a few of the more commonly used ones:

BMR: Basal Metabolic Rate. The amount of calories your body would require to maintain basic bodily functions if you were in a coma.

TDEE: Total Daily Energy Expenditure. The amount of calories you expend by existing (see BMR), daily activities, eating, exercising, etc. This is the level at which you will maintain your current weight; below it you will lose, above it you will gain.

TEF: Thermic Effect of Feeding (Food). The calories your body will expend digesting/processing food (yes, you do expend calories to process the calories you take in).

NEAT: Non-exercise Activity Thermogenesis. The calories you burn doing things other than exercise; shopping, taking care of the kids, driving, working on the computer, etc.

EAT: Exercise Activity Thermogenesis. The calories you expend while exercising.

LBM: Lean Body Mass. Everything in your body that isn't fat: muscle, connective tissue, organs, water, food, etc.

BF or BF%: Body fat percentage.

Macros: Macronutrients. Protein, Fat and Carbohydrates (and technically Alcohol, which is in a category of its own).

NSV: Non-scale victory. A triumph not related purely to scale weight - fitting into smaller size clothes, a compliment somebody gave you about your weight loss, being able to do a push-up when you couldn't before, improved blood test results from your health/fitness efforts, etc.

NROLFW, NROL4W: New Rules of Lifting for Women. A popular strength training program.

VLCD: Very Low Calorie Diet. Creating an unnecessarily large caloric deficit, usually involving the intake of less than 1000-1200 calories per day.

HRM: Heart Rate Monitor. A device usually consisting of a chest band and a watch, which measures your heart rate while exercising and (theoretically) tells you how many calories you've burned. (I say theoretically because it doesn't actually measure calories burned - it uses an algorithm based upon user statistics and heart rate to predict how many calories you burned)

30DS - 30-day Shred. A popular video workout.

C25K - Couch to 5K. A popular beginning runner's program designed to move you from being sedentary to being capable of running a 5K event.

HIIT: High-Intensity Interval Training. A training program involving short periods of maximal effort interspersed with rest periods in between.

LISS: Low-Intensity Steady State. Cardio exercise done for longer durations at lower levels of intensity (treadmill, stairclimber, walking, etc.)