Darklord said:
Ho-ing - I found some hookers hear a petrol station and was able to start it.
Tow Truck - Steal a tow truck and press Y.
Mugging - Aimed a gun at a store owners head for 5 seconds then keep it aimed at them while they walk to the safe and open it.
Streaking - Go to your wardrobe, go to suits and remove all clothing.
Flashing - Buy a coat, take all clothes off except the coat.
Not sure about Barnstorming, Driving Stunts or Combat Tricks unless he means the basic driving stunts like jumping and stuff.
Your Mugging explanation is wrong. What you're describing is just the regular store holdups.
Barnstorming- Grab a plane and fly through certain "stunt areas" to initiate it. Flying through hangers and out the other side, flying through windows in buildings under signs, bridges overpasses etc. Some areas can be done with choppers or the UFO.
Ho-ing- Gas station bathrooms and private booths in strip clubs.
Tow Truck- Yeah, grab a towtruck and the prompt will come up automatically.
Combat Tricks- Combos, finishers, headshots, nut shots, generally just killing gang members/people in fancy ways.
Driving Stunts- Self explanatory. Wheelies, powerslides, catching air, going up on two wheels with a car/truck etc.
Mugging- Walk up to someone on the street or elsewhere (easier if they're standing still or sitting) and use fine aim to aim at them. They'll notice you after a second, get scared and drop their cash and run.
Streaking- Yeah, that's right.
Flashing- You need a special "Flasher's Coat" which you can get in the costume shop in the Rounds Square Mall. Then just go to your wardrobe (you can do this in any store or hideout) and remove everything you're wearing and just put on the coat. It'll start automatically.