1. Cheerfully irresponsible
   - carefree, devil-may-care, freewheeling, happy-go-lucky, harum-scarum 
2. Dazed from or as if from repeated blows
   "slaphappy with exhaustion"
   - punch-drunk, silly

See also: confused, irresponsible

• PTO
• Ptolemaic
• Ptolemaic dynasty
• Ptolemaic system
• Ptolemies
• Ptolemy
• Ptolemy I
• Ptolemy II
• ptomain
• ptomaine
• ptomaine poisoning
• ptosis
• PTSD
• ptyalin
• ptyalise
• ptyalism
• ptyalith
• ptyalize
• Ptyas
• Ptyas mucosus
• Ptychozoon
• Ptychozoon homalocephalum
• Pu
• pub
• pub-crawl