Originated at Parklands Secondary school, Bexley, (UK) in 1970's
On his first day at the school, follically challenged and slightly effiminate French Language Teacher Mr Samuel Pam was powerless to prevent 1,200 boys adopting a new craze of slapping each others foreheads and coining the phrase Spamhead after we saw that he signed his name SPAM on our report cards.
Mr Pam valliantly endured 12 years of this torture before taking early retirement.
Term later went on to be used as a general discription for anyone who committed the cardinal sin of being boffin or acting a "bit gay"
Boy A - "Well, he was being a spamhead"
Boy B - "No i'm not he spammed me for nuffink!
originated in edmonton county school 1978 when some boys thought wat would happen if you put half a tennis ball on some ones forehead and press it against a wall while holding ther arms down for two minutes so they couldnt tear it off ,Result a massive sucked perfectly round love bite with bits of blood that lasted for two weeks and looked just like a slice of spam meat people where running round slaping foreheads for years after and saying spamhead as they did it this spread like wild fire