See Thumper for the general location. From Thumper, "adventure hike" about 100 yards north to a fern covered talus slope. On your left (west) will be the massive slab of the 4th Flatiron. On your right is a west-facing, vertical wall containing 4 routes. This route is located at the far north end of the talus slope near where the rock forms a small cave. "Hop" up the right side of the cave and clip the bolt over the roof. Hoppy Birthday (5.10a) climbs straight up from here. "Skip" up left heel hooking along the lip of the roof clipping 2 more bolts. Now "Jump" to the jug above. Modern climbers can avoid the jump with skill! Follow easier rock to a belay. Walk off left (north) and follow the gully back to the base.
3 bolts plus small to medium gear.