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An avid baseball fanatic, especially one who frequently utilizes statistical analysis and urges others to do the same.
Old-school baseball scouts tend to hate seamheads like Rob Neyer, always harping about on-base percentage and Win Shares.
seamhead by Travis M. Nelson March 20, 2008
A slaphead is usually a guy who is so naturally bald he makes most bald people look positively hirsuit, but really it can be any guy who is definitely bald or going bald. A slaphead is so obviously bald that you just wish it was acceptable to point out the patently obvious by slapping them 5 or 6 times in rapid succession on their bald shiny head. The term slaphead was actually introduced in the comedy of Benny Hill, a world famous British comedian (deceased). Benny always used a sketch where a small bald man would do something a little annoying to Benny Hill and benny would slap the guy a few times on his bald head.
boy1: What shall I buy my dad for christmas?
boy2: Well your dad's a slaphead so get him some
slaphead polish and a wooly hat

A rhyme sung by errant children to bald guys before running away quickly:

slaphead slaphead over there
what's it like to have no hair
is it hot or is it cold
you would know cuz you're so bald

slaphead by happyslapper January 3, 2008
A quick-witted, thick-skinned individual who believes in speaking the truth at all times. Sometimes at the risk of hurting a person's feelings. Slumheads are usually incredibly funny, and don't pass up the opportunity to engage in heated debates. Often times leaving their NON-Slumhead opponents angry and distraught.
Man...those slumheads are a tough crowd...
slumhead by T.Y.E. July 26, 2006

Slabhead 

Derogatory term for a person with a massive head that looks like a breezeblock, and who usually has a very attractive mum.
''Haha, OLD SLABHEAD!!!, I had your mum last night!''

''SLABHEAD!!!, Stay away from the little children!''
Slabhead by Neb Renlim December 9, 2008
you are a slaphead, you got no hair mate
slaphead by veganito April 10, 2019

spamhead 

meaning - large forehead
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"
Teacher - "why did you hit Jones?"
Boy A - "Well, he was being a spamhead"
Boy B - "No i'm not he spammed me for nuffink!
"
spamhead by Daveyboy Snotling January 28, 2007